diff --git a/MadSpin/decay.py b/MadSpin/decay.py
index 869d32b..0280643 100755
--- a/MadSpin/decay.py
+++ b/MadSpin/decay.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python2
 
 from __future__ import division
 from madgraph.interface import reweight_interface
diff --git a/MadSpin/madspin b/MadSpin/madspin
index c51d27a..d47cff1 100755
--- a/MadSpin/madspin
+++ b/MadSpin/madspin
@@ -1,4 +1,4 @@
-#! /usr/bin/env python
+#!/usr/bin/env python2
 
 ################################################################################
 #
diff --git a/Template/LO/Source/.make_opts b/Template/LO/Source/.make_opts
index eeed925..95eaaf8 100644
--- a/Template/LO/Source/.make_opts
+++ b/Template/LO/Source/.make_opts
@@ -117,5 +117,5 @@ endif
 
 # Helper function to check MG5 version
 define CHECK_MG5AMC_VERSION
-python -c 'import re; from distutils.version import StrictVersion; print StrictVersion("$(MG5AMC_VERSION)") >= StrictVersion("$(1)") if re.match("^[\d\.]+$$","$(MG5AMC_VERSION)") else True;'
+python2 -c 'import re; from distutils.version import StrictVersion; print StrictVersion("$(MG5AMC_VERSION)") >= StrictVersion("$(1)") if re.match("^[\d\.]+$$","$(MG5AMC_VERSION)") else True;'
 endef
\ No newline at end of file
diff --git a/Template/LO/bin/generate_events b/Template/LO/bin/generate_events
index 7ac36c7..18d5ecb 100755
--- a/Template/LO/bin/generate_events
+++ b/Template/LO/bin/generate_events
@@ -1,4 +1,4 @@
-#! /usr/bin/env python
+#!/usr/bin/env python2
 ################################################################################
 #
 # Copyright (c) 2011 The MadGraph5_aMC@NLO Development team and Contributors
diff --git a/Template/LO/bin/internal/Gridpack/gridrun b/Template/LO/bin/internal/Gridpack/gridrun
index 68e523c..7af6c0b 100755
--- a/Template/LO/bin/internal/Gridpack/gridrun
+++ b/Template/LO/bin/internal/Gridpack/gridrun
@@ -1,4 +1,4 @@
-#! /usr/bin/env python
+#!/usr/bin/env python2
 
 ################################################################################
 #
diff --git a/Template/LO/bin/internal/addmasses_optional.py b/Template/LO/bin/internal/addmasses_optional.py
index 10e6f64..a2f3a16 100755
--- a/Template/LO/bin/internal/addmasses_optional.py
+++ b/Template/LO/bin/internal/addmasses_optional.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/env python2
 #
 # doubleswitch.py
 # Author: Stephen Mrenna
diff --git a/Template/LO/bin/madevent b/Template/LO/bin/madevent
index a3d9f71..fc5dfce 100755
--- a/Template/LO/bin/madevent
+++ b/Template/LO/bin/madevent
@@ -1,4 +1,4 @@
-#! /usr/bin/env python
+#!/usr/bin/env python2
 
 ################################################################################
 #
diff --git a/Template/MadWeight/Python/Info.py b/Template/MadWeight/Python/Info.py
index 92b0e81..ec22eca 100755
--- a/Template/MadWeight/Python/Info.py
+++ b/Template/MadWeight/Python/Info.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python2
 
 def giveInfo(class_):
         if type(class_)!=str:
diff --git a/Template/MadWeight/Python/clean.py b/Template/MadWeight/Python/clean.py
index 64a4e35..59d1899 100755
--- a/Template/MadWeight/Python/clean.py
+++ b/Template/MadWeight/Python/clean.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python2
 ##########################################################################
 ##                                                                      ##
 ##                               MadWeight                              ##
diff --git a/Template/MadWeight/Python/expand_MadWeight.py b/Template/MadWeight/Python/expand_MadWeight.py
index abe4909..35ab543 100755
--- a/Template/MadWeight/Python/expand_MadWeight.py
+++ b/Template/MadWeight/Python/expand_MadWeight.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python2
 
 # Module
 import string
diff --git a/Template/MadWeight/Python/madweight.py b/Template/MadWeight/Python/madweight.py
index 953800d..4dcd048 100755
--- a/Template/MadWeight/Python/madweight.py
+++ b/Template/MadWeight/Python/madweight.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python2
 
 # idea have 2 script
 # madweight.py -> direct submission 
diff --git a/Template/MadWeight/Python/put_banner.py b/Template/MadWeight/Python/put_banner.py
index a6a06b8..b0f1ef8 100755
--- a/Template/MadWeight/Python/put_banner.py
+++ b/Template/MadWeight/Python/put_banner.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python2
 ##########################################################################
 ##                                                                      ##
 ##                               MG/ME/MW                               ##
diff --git a/Template/MadWeight/Python/splitbanner.py b/Template/MadWeight/Python/splitbanner.py
index a425a1a..f0e4c4e 100755
--- a/Template/MadWeight/Python/splitbanner.py
+++ b/Template/MadWeight/Python/splitbanner.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python2
 ##########################################################################
 ##                                                                      ##
 ##                               MadWeight                              ##
diff --git a/Template/MadWeight/Python/tests.py b/Template/MadWeight/Python/tests.py
index f5c4731..1154bc6 100755
--- a/Template/MadWeight/Python/tests.py
+++ b/Template/MadWeight/Python/tests.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python 
+#!/usr/bin/env python2
 ####################################################################################################
 ####################################################################################################
 ##                                                                                                ##
diff --git a/Template/MadWeight/bin/madweight.py b/Template/MadWeight/bin/madweight.py
index c8ac32a..c7247bb 100755
--- a/Template/MadWeight/bin/madweight.py
+++ b/Template/MadWeight/bin/madweight.py
@@ -1,4 +1,4 @@
-#! /usr/bin/env python
+#!/usr/bin/env python2
 ################################################################################
 #
 # Copyright (c) 2011 The MadGraph Development team and Contributors
diff --git a/Template/MadWeight/bin/mw_options b/Template/MadWeight/bin/mw_options
index 4a28be1..b98d018 100755
--- a/Template/MadWeight/bin/mw_options
+++ b/Template/MadWeight/bin/mw_options
@@ -1,4 +1,4 @@
-#! /usr/bin/env python
+#!/usr/bin/env python2
 
 ################################################################################
 #
diff --git a/Template/MadWeight/mod_file/check_model.py b/Template/MadWeight/mod_file/check_model.py
index 8e80f6a..a8a2d26 100755
--- a/Template/MadWeight/mod_file/check_model.py
+++ b/Template/MadWeight/mod_file/check_model.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python2
 
 #test
 
diff --git a/Template/MadWeight/mod_file/mod_file.py b/Template/MadWeight/mod_file/mod_file.py
index d95cf20..444933a 100755
--- a/Template/MadWeight/mod_file/mod_file.py
+++ b/Template/MadWeight/mod_file/mod_file.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python2
 
 #Extension
 import string
diff --git a/Template/MadWeight/mod_file/mod_setup_model b/Template/MadWeight/mod_file/mod_setup_model
index a2e32db..380f629 100755
--- a/Template/MadWeight/mod_file/mod_setup_model
+++ b/Template/MadWeight/mod_file/mod_setup_model
@@ -45,7 +45,7 @@ close(INPUT);
 
         if (-e $tfdir."/TF_".$transfer_fct.".dat") {
       print "TF $transfer_fct found  in $tfdir \n";
-      system("python ./bin/change_tf.py $transfer_fct 0");
+      system("python2 ./bin/change_tf.py $transfer_fct 0");
       }
         else{print "Error Transfer function $transfer_fct not found \n";
           exit;
diff --git a/Template/MadWeight/src/makefile b/Template/MadWeight/src/makefile
index eac7b86..0b563b2 100755
--- a/Template/MadWeight/src/makefile
+++ b/Template/MadWeight/src/makefile
@@ -24,9 +24,9 @@ $(PROG): $(PROCESS) $(MW_PS)  makefile $(LIBS)
 	$(FC) $(FFLAGS) -o $(PROG) $(PROCESS) $(MW_PS) $(LINKLIBS)
 
 transfer_card.inc:../../Cards/transfer_card.dat ../../Cards/MadWeight_card.dat
-	python ../../bin/internal/madweight/Cards.py
+	python2 ../../bin/internal/madweight/Cards.py
 madweight_card.inc:../../Cards/transfer_card.dat ../../Cards/MadWeight_card.dat
-	python ../../bin/internal/madweight/Cards.py
+	python2 ../../bin/internal/madweight/Cards.py
 
 driver.o: phasespace.inc nexternal.inc data.inc coupl.inc madweight_card.inc nb_tf.inc
 initialization.o: madweight_card.inc TF_param.inc coupl.inc run.inc madweight_param.inc pmass.inc nexternal.inc maxamps.inc leshouche.inc nb_tf.inc
diff --git a/Template/NLO/MCatNLO/HWAnalyzer/hw6an_HwU_pp_V.f b/Template/NLO/MCatNLO/HWAnalyzer/hw6an_HwU_pp_V.f
index 2744ab3..774152f 100644
--- a/Template/NLO/MCatNLO/HWAnalyzer/hw6an_HwU_pp_V.f
+++ b/Template/NLO/MCatNLO/HWAnalyzer/hw6an_HwU_pp_V.f
@@ -14,7 +14,7 @@ c  <MG5_aMC_install_dir>/madgraph/various/histograms.py
 c
 c You can learn about how to run it and what options are available with
 c
-c  python <MG5_aMC_install_dir>/madgraph/various/histograms.py --help
+c  python2 <MG5_aMC_install_dir>/madgraph/various/histograms.py --help
 c
 C----------------------------------------------------------------------
       SUBROUTINE RCLOS()
diff --git a/Template/NLO/MCatNLO/HWAnalyzer/hw6an_HwU_pp_h.f b/Template/NLO/MCatNLO/HWAnalyzer/hw6an_HwU_pp_h.f
index 0b03a03..baf54ac 100644
--- a/Template/NLO/MCatNLO/HWAnalyzer/hw6an_HwU_pp_h.f
+++ b/Template/NLO/MCatNLO/HWAnalyzer/hw6an_HwU_pp_h.f
@@ -14,7 +14,7 @@ c  <MG5_aMC_install_dir>/madgraph/various/histograms.py
 c
 c You can learn about how to run it and what options are available with
 c
-c  python <MG5_aMC_install_dir>/madgraph/various/histograms.py --help
+c  python2 <MG5_aMC_install_dir>/madgraph/various/histograms.py --help
 c
 C----------------------------------------------------------------------
       SUBROUTINE RCLOS()
diff --git a/Template/NLO/MCatNLO/HWAnalyzer/hw6an_HwU_pp_hjj.f b/Template/NLO/MCatNLO/HWAnalyzer/hw6an_HwU_pp_hjj.f
index 638c542..60ea93b 100644
--- a/Template/NLO/MCatNLO/HWAnalyzer/hw6an_HwU_pp_hjj.f
+++ b/Template/NLO/MCatNLO/HWAnalyzer/hw6an_HwU_pp_hjj.f
@@ -14,7 +14,7 @@ c  <MG5_aMC_install_dir>/madgraph/various/histograms.py
 c
 c You can learn about how to run it and what options are available with
 c
-c  python <MG5_aMC_install_dir>/madgraph/various/histograms.py --help
+c  python2 <MG5_aMC_install_dir>/madgraph/various/histograms.py --help
 c
 C----------------------------------------------------------------------
       SUBROUTINE RCLOS()
diff --git a/Template/NLO/MCatNLO/HWAnalyzer/hw6an_HwU_pp_leptons.f b/Template/NLO/MCatNLO/HWAnalyzer/hw6an_HwU_pp_leptons.f
index 77e1b10..8ff65db 100644
--- a/Template/NLO/MCatNLO/HWAnalyzer/hw6an_HwU_pp_leptons.f
+++ b/Template/NLO/MCatNLO/HWAnalyzer/hw6an_HwU_pp_leptons.f
@@ -14,7 +14,7 @@ c  <MG5_aMC_install_dir>/madgraph/various/histograms.py
 c
 c You can learn about how to run it and what options are available with
 c
-c  python <MG5_aMC_install_dir>/madgraph/various/histograms.py --help
+c  python2 <MG5_aMC_install_dir>/madgraph/various/histograms.py --help
 c
 C----------------------------------------------------------------------
       SUBROUTINE RCLOS()
diff --git a/Template/NLO/MCatNLO/HWAnalyzer/hw6an_HwU_pp_lplm.f b/Template/NLO/MCatNLO/HWAnalyzer/hw6an_HwU_pp_lplm.f
index 7ece1da..15293f4 100644
--- a/Template/NLO/MCatNLO/HWAnalyzer/hw6an_HwU_pp_lplm.f
+++ b/Template/NLO/MCatNLO/HWAnalyzer/hw6an_HwU_pp_lplm.f
@@ -14,7 +14,7 @@ c  <MG5_aMC_install_dir>/madgraph/various/histograms.py
 c
 c You can learn about how to run it and what options are available with
 c
-c  python <MG5_aMC_install_dir>/madgraph/various/histograms.py --help
+c  python2 <MG5_aMC_install_dir>/madgraph/various/histograms.py --help
 c
 C----------------------------------------------------------------------
       SUBROUTINE RCLOS()
diff --git a/Template/NLO/MCatNLO/HWAnalyzer/hw6an_HwU_pp_lvl.f b/Template/NLO/MCatNLO/HWAnalyzer/hw6an_HwU_pp_lvl.f
index e139a82..7d49eae 100644
--- a/Template/NLO/MCatNLO/HWAnalyzer/hw6an_HwU_pp_lvl.f
+++ b/Template/NLO/MCatNLO/HWAnalyzer/hw6an_HwU_pp_lvl.f
@@ -14,7 +14,7 @@ c  <MG5_aMC_install_dir>/madgraph/various/histograms.py
 c
 c You can learn about how to run it and what options are available with
 c
-c  python <MG5_aMC_install_dir>/madgraph/various/histograms.py --help
+c  python2 <MG5_aMC_install_dir>/madgraph/various/histograms.py --help
 c
 C----------------------------------------------------------------------
       SUBROUTINE RCLOS()
diff --git a/Template/NLO/MCatNLO/HWAnalyzer/hw6an_HwU_pp_taptam.f b/Template/NLO/MCatNLO/HWAnalyzer/hw6an_HwU_pp_taptam.f
index 4599579..435024c 100644
--- a/Template/NLO/MCatNLO/HWAnalyzer/hw6an_HwU_pp_taptam.f
+++ b/Template/NLO/MCatNLO/HWAnalyzer/hw6an_HwU_pp_taptam.f
@@ -14,7 +14,7 @@ c  <MG5_aMC_install_dir>/madgraph/various/histograms.py
 c
 c You can learn about how to run it and what options are available with
 c
-c  python <MG5_aMC_install_dir>/madgraph/various/histograms.py --help
+c  python2 <MG5_aMC_install_dir>/madgraph/various/histograms.py --help
 c
 C----------------------------------------------------------------------
       SUBROUTINE RCLOS()
diff --git a/Template/NLO/MCatNLO/HWAnalyzer/hw6an_HwU_pp_tj.f b/Template/NLO/MCatNLO/HWAnalyzer/hw6an_HwU_pp_tj.f
index 8eb4ca4..8d55c42 100644
--- a/Template/NLO/MCatNLO/HWAnalyzer/hw6an_HwU_pp_tj.f
+++ b/Template/NLO/MCatNLO/HWAnalyzer/hw6an_HwU_pp_tj.f
@@ -14,7 +14,7 @@ c  <MG5_aMC_install_dir>/madgraph/various/histograms.py
 c
 c You can learn about how to run it and what options are available with
 c
-c  python <MG5_aMC_install_dir>/madgraph/various/histograms.py --help
+c  python2 <MG5_aMC_install_dir>/madgraph/various/histograms.py --help
 c
 C----------------------------------------------------------------------
       SUBROUTINE RCLOS()
diff --git a/Template/NLO/MCatNLO/HWAnalyzer/hw6an_HwU_pp_ttx.f b/Template/NLO/MCatNLO/HWAnalyzer/hw6an_HwU_pp_ttx.f
index 90f4807..c983fe0 100644
--- a/Template/NLO/MCatNLO/HWAnalyzer/hw6an_HwU_pp_ttx.f
+++ b/Template/NLO/MCatNLO/HWAnalyzer/hw6an_HwU_pp_ttx.f
@@ -14,7 +14,7 @@ c  <MG5_aMC_install_dir>/madgraph/various/histograms.py
 c
 c You can learn about how to run it and what options are available with
 c
-c  python <MG5_aMC_install_dir>/madgraph/various/histograms.py --help
+c  python2 <MG5_aMC_install_dir>/madgraph/various/histograms.py --help
 c
 C----------------------------------------------------------------------
       SUBROUTINE RCLOS()
diff --git a/Template/NLO/MCatNLO/HWAnalyzer/hw6an_HwU_pp_ttx_v2.f b/Template/NLO/MCatNLO/HWAnalyzer/hw6an_HwU_pp_ttx_v2.f
index a419b2a..283d491 100644
--- a/Template/NLO/MCatNLO/HWAnalyzer/hw6an_HwU_pp_ttx_v2.f
+++ b/Template/NLO/MCatNLO/HWAnalyzer/hw6an_HwU_pp_ttx_v2.f
@@ -14,7 +14,7 @@ c  <MG5_aMC_install_dir>/madgraph/various/histograms.py
 c
 c You can learn about how to run it and what options are available with
 c
-c  python <MG5_aMC_install_dir>/madgraph/various/histograms.py --help
+c  python2 <MG5_aMC_install_dir>/madgraph/various/histograms.py --help
 c
 C----------------------------------------------------------------------
       SUBROUTINE RCLOS()
diff --git a/Template/NLO/MCatNLO/HWAnalyzer/hw6an_HwU_rates.f b/Template/NLO/MCatNLO/HWAnalyzer/hw6an_HwU_rates.f
index 1097bb7..0ca587f 100644
--- a/Template/NLO/MCatNLO/HWAnalyzer/hw6an_HwU_rates.f
+++ b/Template/NLO/MCatNLO/HWAnalyzer/hw6an_HwU_rates.f
@@ -11,7 +11,7 @@ c  <MG5_aMC_install_dir>/madgraph/various/histograms.py
 c
 c You can learn about how to run it and what options are available with
 c
-c  python <MG5_aMC_install_dir>/madgraph/various/histograms.py --help
+c  python2 <MG5_aMC_install_dir>/madgraph/various/histograms.py --help
 c
 C----------------------------------------------------------------------
       SUBROUTINE RCLOS()
diff --git a/Template/NLO/MCatNLO/HWPPAnalyzer/hwppan_HwU_pp_V.f b/Template/NLO/MCatNLO/HWPPAnalyzer/hwppan_HwU_pp_V.f
index ee5c3f0..31ad476 100644
--- a/Template/NLO/MCatNLO/HWPPAnalyzer/hwppan_HwU_pp_V.f
+++ b/Template/NLO/MCatNLO/HWPPAnalyzer/hwppan_HwU_pp_V.f
@@ -14,7 +14,7 @@ c  <MG5_aMC_install_dir>/madgraph/various/histograms.py
 c
 c You can learn about how to run it and what options are available with
 c
-c  python <MG5_aMC_install_dir>/madgraph/various/histograms.py --help
+c  python2 <MG5_aMC_install_dir>/madgraph/various/histograms.py --help
 c
 C----------------------------------------------------------------------
       SUBROUTINE RCLOS()
diff --git a/Template/NLO/MCatNLO/HWPPAnalyzer/hwppan_HwU_pp_h.f b/Template/NLO/MCatNLO/HWPPAnalyzer/hwppan_HwU_pp_h.f
index d29e8bf..8d34f27 100644
--- a/Template/NLO/MCatNLO/HWPPAnalyzer/hwppan_HwU_pp_h.f
+++ b/Template/NLO/MCatNLO/HWPPAnalyzer/hwppan_HwU_pp_h.f
@@ -14,7 +14,7 @@ c  <MG5_aMC_install_dir>/madgraph/various/histograms.py
 c
 c You can learn about how to run it and what options are available with
 c
-c  python <MG5_aMC_install_dir>/madgraph/various/histograms.py --help
+c  python2 <MG5_aMC_install_dir>/madgraph/various/histograms.py --help
 c
 C----------------------------------------------------------------------
       SUBROUTINE RCLOS()
diff --git a/Template/NLO/MCatNLO/HWPPAnalyzer/hwppan_HwU_pp_hjj.f b/Template/NLO/MCatNLO/HWPPAnalyzer/hwppan_HwU_pp_hjj.f
index 755294b..af05679 100644
--- a/Template/NLO/MCatNLO/HWPPAnalyzer/hwppan_HwU_pp_hjj.f
+++ b/Template/NLO/MCatNLO/HWPPAnalyzer/hwppan_HwU_pp_hjj.f
@@ -14,7 +14,7 @@ c  <MG5_aMC_install_dir>/madgraph/various/histograms.py
 c
 c You can learn about how to run it and what options are available with
 c
-c  python <MG5_aMC_install_dir>/madgraph/various/histograms.py --help
+c  python2 <MG5_aMC_install_dir>/madgraph/various/histograms.py --help
 c
 C----------------------------------------------------------------------
       SUBROUTINE RCLOS()
diff --git a/Template/NLO/MCatNLO/HWPPAnalyzer/hwppan_HwU_pp_leptons.f b/Template/NLO/MCatNLO/HWPPAnalyzer/hwppan_HwU_pp_leptons.f
index 1c5f4d0..a25539a 100644
--- a/Template/NLO/MCatNLO/HWPPAnalyzer/hwppan_HwU_pp_leptons.f
+++ b/Template/NLO/MCatNLO/HWPPAnalyzer/hwppan_HwU_pp_leptons.f
@@ -14,7 +14,7 @@ c  <MG5_aMC_install_dir>/madgraph/various/histograms.py
 c
 c You can learn about how to run it and what options are available with
 c
-c  python <MG5_aMC_install_dir>/madgraph/various/histograms.py --help
+c  python2 <MG5_aMC_install_dir>/madgraph/various/histograms.py --help
 c
 C----------------------------------------------------------------------
       SUBROUTINE RCLOS()
diff --git a/Template/NLO/MCatNLO/HWPPAnalyzer/hwppan_HwU_pp_lplm.f b/Template/NLO/MCatNLO/HWPPAnalyzer/hwppan_HwU_pp_lplm.f
index 9bb9d18..077b320 100644
--- a/Template/NLO/MCatNLO/HWPPAnalyzer/hwppan_HwU_pp_lplm.f
+++ b/Template/NLO/MCatNLO/HWPPAnalyzer/hwppan_HwU_pp_lplm.f
@@ -14,7 +14,7 @@ c  <MG5_aMC_install_dir>/madgraph/various/histograms.py
 c
 c You can learn about how to run it and what options are available with
 c
-c  python <MG5_aMC_install_dir>/madgraph/various/histograms.py --help
+c  python2 <MG5_aMC_install_dir>/madgraph/various/histograms.py --help
 c
 C----------------------------------------------------------------------
       SUBROUTINE RCLOS()
diff --git a/Template/NLO/MCatNLO/HWPPAnalyzer/hwppan_HwU_pp_lvl.f b/Template/NLO/MCatNLO/HWPPAnalyzer/hwppan_HwU_pp_lvl.f
index eabf4a5..fe66f5a 100644
--- a/Template/NLO/MCatNLO/HWPPAnalyzer/hwppan_HwU_pp_lvl.f
+++ b/Template/NLO/MCatNLO/HWPPAnalyzer/hwppan_HwU_pp_lvl.f
@@ -14,7 +14,7 @@ c  <MG5_aMC_install_dir>/madgraph/various/histograms.py
 c
 c You can learn about how to run it and what options are available with
 c
-c  python <MG5_aMC_install_dir>/madgraph/various/histograms.py --help
+c  python2 <MG5_aMC_install_dir>/madgraph/various/histograms.py --help
 c
 C----------------------------------------------------------------------
       SUBROUTINE RCLOS()
diff --git a/Template/NLO/MCatNLO/HWPPAnalyzer/hwppan_HwU_pp_taptam.f b/Template/NLO/MCatNLO/HWPPAnalyzer/hwppan_HwU_pp_taptam.f
index 86c9818..2b230b1 100644
--- a/Template/NLO/MCatNLO/HWPPAnalyzer/hwppan_HwU_pp_taptam.f
+++ b/Template/NLO/MCatNLO/HWPPAnalyzer/hwppan_HwU_pp_taptam.f
@@ -14,7 +14,7 @@ c  <MG5_aMC_install_dir>/madgraph/various/histograms.py
 c
 c You can learn about how to run it and what options are available with
 c
-c  python <MG5_aMC_install_dir>/madgraph/various/histograms.py --help
+c  python2 <MG5_aMC_install_dir>/madgraph/various/histograms.py --help
 c
 C----------------------------------------------------------------------
       SUBROUTINE RCLOS()
diff --git a/Template/NLO/MCatNLO/HWPPAnalyzer/hwppan_HwU_pp_tj.f b/Template/NLO/MCatNLO/HWPPAnalyzer/hwppan_HwU_pp_tj.f
index 0f57b6e..248bb04 100644
--- a/Template/NLO/MCatNLO/HWPPAnalyzer/hwppan_HwU_pp_tj.f
+++ b/Template/NLO/MCatNLO/HWPPAnalyzer/hwppan_HwU_pp_tj.f
@@ -14,7 +14,7 @@ c  <MG5_aMC_install_dir>/madgraph/various/histograms.py
 c
 c You can learn about how to run it and what options are available with
 c
-c  python <MG5_aMC_install_dir>/madgraph/various/histograms.py --help
+c  python2 <MG5_aMC_install_dir>/madgraph/various/histograms.py --help
 c
 C----------------------------------------------------------------------
       SUBROUTINE RCLOS()
diff --git a/Template/NLO/MCatNLO/HWPPAnalyzer/hwppan_HwU_pp_ttx.f b/Template/NLO/MCatNLO/HWPPAnalyzer/hwppan_HwU_pp_ttx.f
index 263b9e5..81768ee 100644
--- a/Template/NLO/MCatNLO/HWPPAnalyzer/hwppan_HwU_pp_ttx.f
+++ b/Template/NLO/MCatNLO/HWPPAnalyzer/hwppan_HwU_pp_ttx.f
@@ -14,7 +14,7 @@ c  <MG5_aMC_install_dir>/madgraph/various/histograms.py
 c
 c You can learn about how to run it and what options are available with
 c
-c  python <MG5_aMC_install_dir>/madgraph/various/histograms.py --help
+c  python2 <MG5_aMC_install_dir>/madgraph/various/histograms.py --help
 c
 C----------------------------------------------------------------------
       SUBROUTINE RCLOS()
diff --git a/Template/NLO/MCatNLO/HWPPAnalyzer/hwppan_HwU_pp_ttx_v2.f b/Template/NLO/MCatNLO/HWPPAnalyzer/hwppan_HwU_pp_ttx_v2.f
index ec5193d..5e6a121 100644
--- a/Template/NLO/MCatNLO/HWPPAnalyzer/hwppan_HwU_pp_ttx_v2.f
+++ b/Template/NLO/MCatNLO/HWPPAnalyzer/hwppan_HwU_pp_ttx_v2.f
@@ -14,7 +14,7 @@ c  <MG5_aMC_install_dir>/madgraph/various/histograms.py
 c
 c You can learn about how to run it and what options are available with
 c
-c  python <MG5_aMC_install_dir>/madgraph/various/histograms.py --help
+c  python2 <MG5_aMC_install_dir>/madgraph/various/histograms.py --help
 c
 C----------------------------------------------------------------------
       SUBROUTINE RCLOS()
diff --git a/Template/NLO/MCatNLO/HWPPAnalyzer/hwppan_HwU_rates.f b/Template/NLO/MCatNLO/HWPPAnalyzer/hwppan_HwU_rates.f
index 349a83f..235ebe7 100644
--- a/Template/NLO/MCatNLO/HWPPAnalyzer/hwppan_HwU_rates.f
+++ b/Template/NLO/MCatNLO/HWPPAnalyzer/hwppan_HwU_rates.f
@@ -11,7 +11,7 @@ c  <MG5_aMC_install_dir>/madgraph/various/histograms.py
 c
 c You can learn about how to run it and what options are available with
 c
-c  python <MG5_aMC_install_dir>/madgraph/various/histograms.py --help
+c  python2 <MG5_aMC_install_dir>/madgraph/various/histograms.py --help
 c
 C----------------------------------------------------------------------
       SUBROUTINE RCLOS()
diff --git a/Template/NLO/MCatNLO/PY8Analyzer/py8an_HwU_pp_V.f b/Template/NLO/MCatNLO/PY8Analyzer/py8an_HwU_pp_V.f
index 06da454..3b36816 100644
--- a/Template/NLO/MCatNLO/PY8Analyzer/py8an_HwU_pp_V.f
+++ b/Template/NLO/MCatNLO/PY8Analyzer/py8an_HwU_pp_V.f
@@ -14,7 +14,7 @@ c  <MG5_aMC_install_dir>/madgraph/various/histograms.py
 c
 c You can learn about how to run it and what options are available with
 c
-c  python <MG5_aMC_install_dir>/madgraph/various/histograms.py --help
+c  python2 <MG5_aMC_install_dir>/madgraph/various/histograms.py --help
 c
 C----------------------------------------------------------------------
       SUBROUTINE RCLOS()
diff --git a/Template/NLO/MCatNLO/PY8Analyzer/py8an_HwU_pp_h.f b/Template/NLO/MCatNLO/PY8Analyzer/py8an_HwU_pp_h.f
index 9351780..6046bea 100644
--- a/Template/NLO/MCatNLO/PY8Analyzer/py8an_HwU_pp_h.f
+++ b/Template/NLO/MCatNLO/PY8Analyzer/py8an_HwU_pp_h.f
@@ -14,7 +14,7 @@ c  <MG5_aMC_install_dir>/madgraph/various/histograms.py
 c
 c You can learn about how to run it and what options are available with
 c
-c  python <MG5_aMC_install_dir>/madgraph/various/histograms.py --help
+c  python2 <MG5_aMC_install_dir>/madgraph/various/histograms.py --help
 c
 C----------------------------------------------------------------------
       SUBROUTINE RCLOS()
diff --git a/Template/NLO/MCatNLO/PY8Analyzer/py8an_HwU_pp_hjj.f b/Template/NLO/MCatNLO/PY8Analyzer/py8an_HwU_pp_hjj.f
index 148722e..53d6ff7 100644
--- a/Template/NLO/MCatNLO/PY8Analyzer/py8an_HwU_pp_hjj.f
+++ b/Template/NLO/MCatNLO/PY8Analyzer/py8an_HwU_pp_hjj.f
@@ -14,7 +14,7 @@ c  <MG5_aMC_install_dir>/madgraph/various/histograms.py
 c
 c You can learn about how to run it and what options are available with
 c
-c  python <MG5_aMC_install_dir>/madgraph/various/histograms.py --help
+c  python2 <MG5_aMC_install_dir>/madgraph/various/histograms.py --help
 c
 C----------------------------------------------------------------------
       SUBROUTINE RCLOS()
diff --git a/Template/NLO/MCatNLO/PY8Analyzer/py8an_HwU_pp_leptons.f b/Template/NLO/MCatNLO/PY8Analyzer/py8an_HwU_pp_leptons.f
index f23fc70..fd18023 100644
--- a/Template/NLO/MCatNLO/PY8Analyzer/py8an_HwU_pp_leptons.f
+++ b/Template/NLO/MCatNLO/PY8Analyzer/py8an_HwU_pp_leptons.f
@@ -14,7 +14,7 @@ c  <MG5_aMC_install_dir>/madgraph/various/histograms.py
 c
 c You can learn about how to run it and what options are available with
 c
-c  python <MG5_aMC_install_dir>/madgraph/various/histograms.py --help
+c  python2 <MG5_aMC_install_dir>/madgraph/various/histograms.py --help
 c
 C----------------------------------------------------------------------
       SUBROUTINE RCLOS()
diff --git a/Template/NLO/MCatNLO/PY8Analyzer/py8an_HwU_pp_lplm.f b/Template/NLO/MCatNLO/PY8Analyzer/py8an_HwU_pp_lplm.f
index 39ea2e5..590944f 100644
--- a/Template/NLO/MCatNLO/PY8Analyzer/py8an_HwU_pp_lplm.f
+++ b/Template/NLO/MCatNLO/PY8Analyzer/py8an_HwU_pp_lplm.f
@@ -14,7 +14,7 @@ c  <MG5_aMC_install_dir>/madgraph/various/histograms.py
 c
 c You can learn about how to run it and what options are available with
 c
-c  python <MG5_aMC_install_dir>/madgraph/various/histograms.py --help
+c  python2 <MG5_aMC_install_dir>/madgraph/various/histograms.py --help
 c
 C----------------------------------------------------------------------
       SUBROUTINE RCLOS()
diff --git a/Template/NLO/MCatNLO/PY8Analyzer/py8an_HwU_pp_lvl.f b/Template/NLO/MCatNLO/PY8Analyzer/py8an_HwU_pp_lvl.f
index 186ff75..9c24793 100644
--- a/Template/NLO/MCatNLO/PY8Analyzer/py8an_HwU_pp_lvl.f
+++ b/Template/NLO/MCatNLO/PY8Analyzer/py8an_HwU_pp_lvl.f
@@ -14,7 +14,7 @@ c  <MG5_aMC_install_dir>/madgraph/various/histograms.py
 c
 c You can learn about how to run it and what options are available with
 c
-c  python <MG5_aMC_install_dir>/madgraph/various/histograms.py --help
+c  python2 <MG5_aMC_install_dir>/madgraph/various/histograms.py --help
 c
 C----------------------------------------------------------------------
       SUBROUTINE RCLOS()
diff --git a/Template/NLO/MCatNLO/PY8Analyzer/py8an_HwU_pp_taptam.f b/Template/NLO/MCatNLO/PY8Analyzer/py8an_HwU_pp_taptam.f
index dbde5ba..f9f474c 100644
--- a/Template/NLO/MCatNLO/PY8Analyzer/py8an_HwU_pp_taptam.f
+++ b/Template/NLO/MCatNLO/PY8Analyzer/py8an_HwU_pp_taptam.f
@@ -14,7 +14,7 @@ c  <MG5_aMC_install_dir>/madgraph/various/histograms.py
 c
 c You can learn about how to run it and what options are available with
 c
-c  python <MG5_aMC_install_dir>/madgraph/various/histograms.py --help
+c  python2 <MG5_aMC_install_dir>/madgraph/various/histograms.py --help
 c
 C----------------------------------------------------------------------
       SUBROUTINE RCLOS()
diff --git a/Template/NLO/MCatNLO/PY8Analyzer/py8an_HwU_pp_tj.f b/Template/NLO/MCatNLO/PY8Analyzer/py8an_HwU_pp_tj.f
index c9b65c2..ba4b40e 100644
--- a/Template/NLO/MCatNLO/PY8Analyzer/py8an_HwU_pp_tj.f
+++ b/Template/NLO/MCatNLO/PY8Analyzer/py8an_HwU_pp_tj.f
@@ -14,7 +14,7 @@ c  <MG5_aMC_install_dir>/madgraph/various/histograms.py
 c
 c You can learn about how to run it and what options are available with
 c
-c  python <MG5_aMC_install_dir>/madgraph/various/histograms.py --help
+c  python2 <MG5_aMC_install_dir>/madgraph/various/histograms.py --help
 c
 C----------------------------------------------------------------------
       SUBROUTINE RCLOS()
diff --git a/Template/NLO/MCatNLO/PY8Analyzer/py8an_HwU_pp_ttx.f b/Template/NLO/MCatNLO/PY8Analyzer/py8an_HwU_pp_ttx.f
index a3921f7..f0223a3 100644
--- a/Template/NLO/MCatNLO/PY8Analyzer/py8an_HwU_pp_ttx.f
+++ b/Template/NLO/MCatNLO/PY8Analyzer/py8an_HwU_pp_ttx.f
@@ -14,7 +14,7 @@ c  <MG5_aMC_install_dir>/madgraph/various/histograms.py
 c
 c You can learn about how to run it and what options are available with
 c
-c  python <MG5_aMC_install_dir>/madgraph/various/histograms.py --help
+c  python2 <MG5_aMC_install_dir>/madgraph/various/histograms.py --help
 c
 C----------------------------------------------------------------------
       SUBROUTINE RCLOS()
diff --git a/Template/NLO/MCatNLO/PY8Analyzer/py8an_HwU_pp_ttx_v2.f b/Template/NLO/MCatNLO/PY8Analyzer/py8an_HwU_pp_ttx_v2.f
index 4b77215..0b18ece 100644
--- a/Template/NLO/MCatNLO/PY8Analyzer/py8an_HwU_pp_ttx_v2.f
+++ b/Template/NLO/MCatNLO/PY8Analyzer/py8an_HwU_pp_ttx_v2.f
@@ -14,7 +14,7 @@ c  <MG5_aMC_install_dir>/madgraph/various/histograms.py
 c
 c You can learn about how to run it and what options are available with
 c
-c  python <MG5_aMC_install_dir>/madgraph/various/histograms.py --help
+c  python2 <MG5_aMC_install_dir>/madgraph/various/histograms.py --help
 c
 C----------------------------------------------------------------------
       SUBROUTINE RCLOS()
diff --git a/Template/NLO/MCatNLO/PY8Analyzer/py8an_HwU_rates.f b/Template/NLO/MCatNLO/PY8Analyzer/py8an_HwU_rates.f
index a3d878c..ffe3751 100644
--- a/Template/NLO/MCatNLO/PY8Analyzer/py8an_HwU_rates.f
+++ b/Template/NLO/MCatNLO/PY8Analyzer/py8an_HwU_rates.f
@@ -11,7 +11,7 @@ c  <MG5_aMC_install_dir>/madgraph/various/histograms.py
 c
 c You can learn about how to run it and what options are available with
 c
-c  python <MG5_aMC_install_dir>/madgraph/various/histograms.py --help
+c  python2 <MG5_aMC_install_dir>/madgraph/various/histograms.py --help
 c
 C----------------------------------------------------------------------
       SUBROUTINE RCLOS()
diff --git a/Template/NLO/MCatNLO/PYAnalyzer/py6an_HwU_pp_V.f b/Template/NLO/MCatNLO/PYAnalyzer/py6an_HwU_pp_V.f
index 846c3f1..96c55e3 100644
--- a/Template/NLO/MCatNLO/PYAnalyzer/py6an_HwU_pp_V.f
+++ b/Template/NLO/MCatNLO/PYAnalyzer/py6an_HwU_pp_V.f
@@ -14,7 +14,7 @@ c  <MG5_aMC_install_dir>/madgraph/various/histograms.py
 c
 c You can learn about how to run it and what options are available with
 c
-c  python <MG5_aMC_install_dir>/madgraph/various/histograms.py --help
+c  python2 <MG5_aMC_install_dir>/madgraph/various/histograms.py --help
 c
 C----------------------------------------------------------------------
       SUBROUTINE RCLOS()
diff --git a/Template/NLO/MCatNLO/PYAnalyzer/py6an_HwU_pp_h.f b/Template/NLO/MCatNLO/PYAnalyzer/py6an_HwU_pp_h.f
index 48b123b..1c4df47 100644
--- a/Template/NLO/MCatNLO/PYAnalyzer/py6an_HwU_pp_h.f
+++ b/Template/NLO/MCatNLO/PYAnalyzer/py6an_HwU_pp_h.f
@@ -14,7 +14,7 @@ c  <MG5_aMC_install_dir>/madgraph/various/histograms.py
 c
 c You can learn about how to run it and what options are available with
 c
-c  python <MG5_aMC_install_dir>/madgraph/various/histograms.py --help
+c  python2 <MG5_aMC_install_dir>/madgraph/various/histograms.py --help
 c
 
 C----------------------------------------------------------------------
diff --git a/Template/NLO/MCatNLO/PYAnalyzer/py6an_HwU_pp_hjj.f b/Template/NLO/MCatNLO/PYAnalyzer/py6an_HwU_pp_hjj.f
index 65cd559..c881c0f 100644
--- a/Template/NLO/MCatNLO/PYAnalyzer/py6an_HwU_pp_hjj.f
+++ b/Template/NLO/MCatNLO/PYAnalyzer/py6an_HwU_pp_hjj.f
@@ -14,7 +14,7 @@ c  <MG5_aMC_install_dir>/madgraph/various/histograms.py
 c
 c You can learn about how to run it and what options are available with
 c
-c  python <MG5_aMC_install_dir>/madgraph/various/histograms.py --help
+c  python2 <MG5_aMC_install_dir>/madgraph/various/histograms.py --help
 c
 
 C----------------------------------------------------------------------
diff --git a/Template/NLO/MCatNLO/PYAnalyzer/py6an_HwU_pp_leptons.f b/Template/NLO/MCatNLO/PYAnalyzer/py6an_HwU_pp_leptons.f
index cd76a79..96250ec 100644
--- a/Template/NLO/MCatNLO/PYAnalyzer/py6an_HwU_pp_leptons.f
+++ b/Template/NLO/MCatNLO/PYAnalyzer/py6an_HwU_pp_leptons.f
@@ -14,7 +14,7 @@ c  <MG5_aMC_install_dir>/madgraph/various/histograms.py
 c
 c You can learn about how to run it and what options are available with
 c
-c  python <MG5_aMC_install_dir>/madgraph/various/histograms.py --help
+c  python2 <MG5_aMC_install_dir>/madgraph/various/histograms.py --help
 c
 C----------------------------------------------------------------------
       SUBROUTINE RCLOS()
diff --git a/Template/NLO/MCatNLO/PYAnalyzer/py6an_HwU_pp_lplm.f b/Template/NLO/MCatNLO/PYAnalyzer/py6an_HwU_pp_lplm.f
index 92fea41..8b87d87 100644
--- a/Template/NLO/MCatNLO/PYAnalyzer/py6an_HwU_pp_lplm.f
+++ b/Template/NLO/MCatNLO/PYAnalyzer/py6an_HwU_pp_lplm.f
@@ -14,7 +14,7 @@ c  <MG5_aMC_install_dir>/madgraph/various/histograms.py
 c
 c You can learn about how to run it and what options are available with
 c
-c  python <MG5_aMC_install_dir>/madgraph/various/histograms.py --help
+c  python2 <MG5_aMC_install_dir>/madgraph/various/histograms.py --help
 c
 C----------------------------------------------------------------------
       SUBROUTINE RCLOS()
diff --git a/Template/NLO/MCatNLO/PYAnalyzer/py6an_HwU_pp_lvl.f b/Template/NLO/MCatNLO/PYAnalyzer/py6an_HwU_pp_lvl.f
index 18cfd55..6b10a1d 100644
--- a/Template/NLO/MCatNLO/PYAnalyzer/py6an_HwU_pp_lvl.f
+++ b/Template/NLO/MCatNLO/PYAnalyzer/py6an_HwU_pp_lvl.f
@@ -14,7 +14,7 @@ c  <MG5_aMC_install_dir>/madgraph/various/histograms.py
 c
 c You can learn about how to run it and what options are available with
 c
-c  python <MG5_aMC_install_dir>/madgraph/various/histograms.py --help
+c  python2 <MG5_aMC_install_dir>/madgraph/various/histograms.py --help
 c
 C----------------------------------------------------------------------
       SUBROUTINE RCLOS()
diff --git a/Template/NLO/MCatNLO/PYAnalyzer/py6an_HwU_pp_taptam.f b/Template/NLO/MCatNLO/PYAnalyzer/py6an_HwU_pp_taptam.f
index 52ed987..de73992 100644
--- a/Template/NLO/MCatNLO/PYAnalyzer/py6an_HwU_pp_taptam.f
+++ b/Template/NLO/MCatNLO/PYAnalyzer/py6an_HwU_pp_taptam.f
@@ -14,7 +14,7 @@ c  <MG5_aMC_install_dir>/madgraph/various/histograms.py
 c
 c You can learn about how to run it and what options are available with
 c
-c  python <MG5_aMC_install_dir>/madgraph/various/histograms.py --help
+c  python2 <MG5_aMC_install_dir>/madgraph/various/histograms.py --help
 c
 
 C----------------------------------------------------------------------
diff --git a/Template/NLO/MCatNLO/PYAnalyzer/py6an_HwU_pp_tj.f b/Template/NLO/MCatNLO/PYAnalyzer/py6an_HwU_pp_tj.f
index 8020ba3..2370064 100644
--- a/Template/NLO/MCatNLO/PYAnalyzer/py6an_HwU_pp_tj.f
+++ b/Template/NLO/MCatNLO/PYAnalyzer/py6an_HwU_pp_tj.f
@@ -14,7 +14,7 @@ c  <MG5_aMC_install_dir>/madgraph/various/histograms.py
 c
 c You can learn about how to run it and what options are available with
 c
-c  python <MG5_aMC_install_dir>/madgraph/various/histograms.py --help
+c  python2 <MG5_aMC_install_dir>/madgraph/various/histograms.py --help
 c
 
 C----------------------------------------------------------------------
diff --git a/Template/NLO/MCatNLO/PYAnalyzer/py6an_HwU_pp_ttx.f b/Template/NLO/MCatNLO/PYAnalyzer/py6an_HwU_pp_ttx.f
index 1826ede..df37176 100644
--- a/Template/NLO/MCatNLO/PYAnalyzer/py6an_HwU_pp_ttx.f
+++ b/Template/NLO/MCatNLO/PYAnalyzer/py6an_HwU_pp_ttx.f
@@ -14,7 +14,7 @@ c  <MG5_aMC_install_dir>/madgraph/various/histograms.py
 c
 c You can learn about how to run it and what options are available with
 c
-c  python <MG5_aMC_install_dir>/madgraph/various/histograms.py --help
+c  python2 <MG5_aMC_install_dir>/madgraph/various/histograms.py --help
 c
 
 C----------------------------------------------------------------------
diff --git a/Template/NLO/MCatNLO/PYAnalyzer/py6an_HwU_pp_ttx_v2.f b/Template/NLO/MCatNLO/PYAnalyzer/py6an_HwU_pp_ttx_v2.f
index c22f9be..78755ea 100644
--- a/Template/NLO/MCatNLO/PYAnalyzer/py6an_HwU_pp_ttx_v2.f
+++ b/Template/NLO/MCatNLO/PYAnalyzer/py6an_HwU_pp_ttx_v2.f
@@ -14,7 +14,7 @@ c  <MG5_aMC_install_dir>/madgraph/various/histograms.py
 c
 c You can learn about how to run it and what options are available with
 c
-c  python <MG5_aMC_install_dir>/madgraph/various/histograms.py --help
+c  python2 <MG5_aMC_install_dir>/madgraph/various/histograms.py --help
 c
 
 C----------------------------------------------------------------------
diff --git a/Template/NLO/MCatNLO/PYAnalyzer/py6an_HwU_rates.f b/Template/NLO/MCatNLO/PYAnalyzer/py6an_HwU_rates.f
index 10e2b80..8b01f55 100644
--- a/Template/NLO/MCatNLO/PYAnalyzer/py6an_HwU_rates.f
+++ b/Template/NLO/MCatNLO/PYAnalyzer/py6an_HwU_rates.f
@@ -11,7 +11,7 @@ c  <MG5_aMC_install_dir>/madgraph/various/histograms.py
 c
 c You can learn about how to run it and what options are available with
 c
-c  python <MG5_aMC_install_dir>/madgraph/various/histograms.py --help
+c  python2 <MG5_aMC_install_dir>/madgraph/various/histograms.py --help
 c
 C----------------------------------------------------------------------
       SUBROUTINE RCLOS()
diff --git a/Template/NLO/Utilities/NLO_Born3.py b/Template/NLO/Utilities/NLO_Born3.py
index dbb8173..c5edaf1 100755
--- a/Template/NLO/Utilities/NLO_Born3.py
+++ b/Template/NLO/Utilities/NLO_Born3.py
@@ -1,4 +1,4 @@
-#! /usr/bin/env python
+#!/usr/bin/env python2
 
 inp = open('./MADatNLO.top', 'r')
 out = open('./MADatNLO_combined.top', 'w')
diff --git a/Template/NLO/Utilities/VetoPrefactors/resum_reweighter.py b/Template/NLO/Utilities/VetoPrefactors/resum_reweighter.py
index f7ba469..fb604a6 100755
--- a/Template/NLO/Utilities/VetoPrefactors/resum_reweighter.py
+++ b/Template/NLO/Utilities/VetoPrefactors/resum_reweighter.py
@@ -1,4 +1,4 @@
-#! /usr/bin/env python
+#!/usr/bin/env python2
 
 ################################################################################
 #
diff --git a/Template/NLO/Utilities/VetoPrefactors/virt_reweighter.py b/Template/NLO/Utilities/VetoPrefactors/virt_reweighter.py
index 87a75fa..a5eaa77 100755
--- a/Template/NLO/Utilities/VetoPrefactors/virt_reweighter.py
+++ b/Template/NLO/Utilities/VetoPrefactors/virt_reweighter.py
@@ -1,4 +1,4 @@
-#! /usr/bin/env python
+#!/usr/bin/env python2
 
 ################################################################################
 #
diff --git a/Template/NLO/bin/aMCatNLO b/Template/NLO/bin/aMCatNLO
index e1a347f..88fd730 100755
--- a/Template/NLO/bin/aMCatNLO
+++ b/Template/NLO/bin/aMCatNLO
@@ -1,4 +1,4 @@
-#! /usr/bin/env python
+#!/usr/bin/env python2
 
 ################################################################################
 #
diff --git a/Template/NLO/bin/calculate_xsect b/Template/NLO/bin/calculate_xsect
index 5000f2a..2616864 100755
--- a/Template/NLO/bin/calculate_xsect
+++ b/Template/NLO/bin/calculate_xsect
@@ -1,4 +1,4 @@
-#! /usr/bin/env python
+#!/usr/bin/env python2
 ################################################################################
 #
 # Copyright (c) 2011 The MadGraph5_aMC@NLO Development team and Contributors
diff --git a/Template/NLO/bin/generate_events b/Template/NLO/bin/generate_events
index 7302c07..57f68b8 100755
--- a/Template/NLO/bin/generate_events
+++ b/Template/NLO/bin/generate_events
@@ -1,4 +1,4 @@
-#! /usr/bin/env python
+#!/usr/bin/env python2
 ################################################################################
 #
 # Copyright (c) 2011 The MadGraph5_aMC@NLO Development team and Contributors
diff --git a/Template/NLO/bin/internal/split_jobs.py b/Template/NLO/bin/internal/split_jobs.py
index 0b50e56..7af39a1 100755
--- a/Template/NLO/bin/internal/split_jobs.py
+++ b/Template/NLO/bin/internal/split_jobs.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python2
 #  MZ, 2012-06-14
 import os
 import sys
diff --git a/Template/NLO/bin/shower b/Template/NLO/bin/shower
index 5bde455..065565b 100755
--- a/Template/NLO/bin/shower
+++ b/Template/NLO/bin/shower
@@ -1,4 +1,4 @@
-#! /usr/bin/env python
+#!/usr/bin/env python2
 ################################################################################
 #
 # Copyright (c) 2011 The MadGraph5_aMC@NLO Development team and Contributors
diff --git a/aloha/bin/aloha b/aloha/bin/aloha
index 2fe8b10..e3b177a 100755
--- a/aloha/bin/aloha
+++ b/aloha/bin/aloha
@@ -1,4 +1,4 @@
-#! /usr/bin/env python
+#!/usr/bin/env python2
 
 
 import sys
diff --git a/bin/.compile.py b/bin/.compile.py
index 0f396d6..783cf3f 100755
--- a/bin/.compile.py
+++ b/bin/.compile.py
@@ -1,4 +1,4 @@
-#! /usr/bin/env python
+#!/usr/bin/env python2
 ################################################################################
 #
 # Copyright (c) 2009 The MadGraph5_aMC@NLO Development team and Contributors
@@ -285,9 +285,9 @@ class Compile_MG5:
 
     def precompilation(self, debug=False):
         if debug:
-            subprocess.call('python -m compileall .', shell=True, cwd=root_path)            
+            subprocess.call('python2 -m compileall .', shell=True, cwd=root_path)            
         else:
-            subprocess.call('python -O -m compileall .', shell=True, cwd=root_path)
+            subprocess.call('python2 -O -m compileall .', shell=True, cwd=root_path)
 
 if __name__ == '__main__':
     Compile_MG5(sys.argv[1:])
diff --git a/bin/mg5 b/bin/mg5
index 9a0d695..99b0531 100755
--- a/bin/mg5
+++ b/bin/mg5
@@ -1,4 +1,4 @@
-#! /usr/bin/env python
+#!/usr/bin/env python2
 
 ################################################################################
 #
diff --git a/bin/mg5_aMC b/bin/mg5_aMC
index 7dac966..e8bbd11 100755
--- a/bin/mg5_aMC
+++ b/bin/mg5_aMC
@@ -1,4 +1,4 @@
-#! /usr/bin/env python
+#!/usr/bin/env python2
 import time
 start = time.time()
 
diff --git a/madgraph/interface/common_run_interface.py b/madgraph/interface/common_run_interface.py
index 52a4cb5..8e66199 100755
--- a/madgraph/interface/common_run_interface.py
+++ b/madgraph/interface/common_run_interface.py
@@ -899,7 +899,7 @@ class CommonRunCmd(HelpToCmd, CheckValidForCmd, cmd.Cmd):
                 fsock.close()
                 return
             else:
-                subprocess.call(['python', 'write_param_card.py'],
+                subprocess.call(['python2', 'write_param_card.py'],
                              cwd=pjoin(self.me_dir,'bin','internal','ufomodel'))
                 default = pjoin(self.me_dir,'bin','internal','ufomodel','param_card.dat')
 
diff --git a/madgraph/interface/madgraph_interface.py b/madgraph/interface/madgraph_interface.py
index b73b077..d12a7df 100755
--- a/madgraph/interface/madgraph_interface.py
+++ b/madgraph/interface/madgraph_interface.py
@@ -6319,7 +6319,7 @@ MG5aMC that supports quadruple precision (typically g++ based on gcc 4.6+).""")
             if new_interface:
                 ff = open(pjoin(MG5DIR, 'bin', '%s.py' % name) , 'w') 
                 if __debug__:
-                    text = '''#! /usr/bin/env python
+                    text = '''#!/usr/bin/env python2
 import os
 import sys
 root_path = os.path.split(os.path.dirname(os.path.realpath( __file__ )))[0]
@@ -6328,7 +6328,7 @@ sys.argv.pop(0)
 os.system('%s  -tt %s %s --mode={0}' %(sys.executable, str(exe_path) , ' '.join(sys.argv) ))
 '''.format(name)                    
                 else:
-                    text = '''#! /usr/bin/env python
+                    text = '''#!/usr/bin/env python2
 import os
 import sys
 root_path = os.path.split(os.path.dirname(os.path.realpath( __file__ )))[0]
diff --git a/madgraph/iolibs/gen_infohtml.py b/madgraph/iolibs/gen_infohtml.py
index 52acde6..2bdd639 100755
--- a/madgraph/iolibs/gen_infohtml.py
+++ b/madgraph/iolibs/gen_infohtml.py
@@ -1,4 +1,4 @@
-#! /usr/bin/env python
+#!/usr/bin/env python2
 ################################################################################
 #
 # Copyright (c) 2009 The MadGraph5_aMC@NLO Development team and Contributors
diff --git a/madgraph/iolibs/template_files/loop_optimized/check_sa.py.inc b/madgraph/iolibs/template_files/loop_optimized/check_sa.py.inc
index 29e1b66..263abee 100644
--- a/madgraph/iolibs/template_files/loop_optimized/check_sa.py.inc
+++ b/madgraph/iolibs/template_files/loop_optimized/check_sa.py.inc
@@ -1,4 +1,4 @@
-#! /usr/bin/env python
+#!/usr/bin/env python2
 
 # This is an example of how to run MadLoop from Python using the f2py compilation of the wrapper file 'f2py_wrapper.f'.
 
diff --git a/madgraph/iolibs/template_files/loop_optimized/check_sa_all.py.inc b/madgraph/iolibs/template_files/loop_optimized/check_sa_all.py.inc
index 44d8a53..08cc1c8 100644
--- a/madgraph/iolibs/template_files/loop_optimized/check_sa_all.py.inc
+++ b/madgraph/iolibs/template_files/loop_optimized/check_sa_all.py.inc
@@ -1,4 +1,4 @@
-#! /usr/bin/env python
+#!/usr/bin/env python2
 
 # This is an example of how to run MadLoop from Python using the f2py compilation of the wrapper file 'f2py_wrapper.f'.
 
diff --git a/madgraph/madweight/Cards.py b/madgraph/madweight/Cards.py
index 1c949db..70605e4 100755
--- a/madgraph/madweight/Cards.py
+++ b/madgraph/madweight/Cards.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python2
 ##########################################################################
 ##                                                                      ##
 ##                               MadWeight                              ##
diff --git a/madgraph/madweight/MW_driver.py b/madgraph/madweight/MW_driver.py
index f075c47..a1d4f36 100755
--- a/madgraph/madweight/MW_driver.py
+++ b/madgraph/madweight/MW_driver.py
@@ -1,4 +1,4 @@
-#! /usr/bin/env python
+#!/usr/bin/env python2
 ################################################################################
 # Copyright (c) 2012 The MadGraph Development team and Contributors             
 #
diff --git a/madgraph/madweight/MW_info.py b/madgraph/madweight/MW_info.py
index acaa43d..20592e6 100755
--- a/madgraph/madweight/MW_info.py
+++ b/madgraph/madweight/MW_info.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python2
 ##########################################################################
 ##                                                                      ##
 ##                               MadWeight                              ##
diff --git a/madgraph/madweight/blob_solution.py b/madgraph/madweight/blob_solution.py
index 571b420..660d778 100755
--- a/madgraph/madweight/blob_solution.py
+++ b/madgraph/madweight/blob_solution.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python2
 
 try:
     import madgraph.madweight.particle_class as particle_class
diff --git a/madgraph/madweight/change_tf.py b/madgraph/madweight/change_tf.py
index 4717715..f1b6e7c 100755
--- a/madgraph/madweight/change_tf.py
+++ b/madgraph/madweight/change_tf.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python2
 
 #Extension
 
diff --git a/madgraph/madweight/create_param.py b/madgraph/madweight/create_param.py
index f8fbb43..b80a490 100755
--- a/madgraph/madweight/create_param.py
+++ b/madgraph/madweight/create_param.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python2
 ##########################################################################
 ##                                                                      ##
 ##                               MadWeight                              ##
diff --git a/madgraph/madweight/create_run.py b/madgraph/madweight/create_run.py
index 2fa5a6d..49b76ef 100755
--- a/madgraph/madweight/create_run.py
+++ b/madgraph/madweight/create_run.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python2
 
 #Extension
 import string,os,sys,re,popen2,time,stat,filecmp
diff --git a/madgraph/madweight/diagram_class.py b/madgraph/madweight/diagram_class.py
index 1e35e71..96a45b1 100755
--- a/madgraph/madweight/diagram_class.py
+++ b/madgraph/madweight/diagram_class.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python2
 
 import sys
 import logging
diff --git a/madgraph/madweight/mod_file.py b/madgraph/madweight/mod_file.py
index 5b3242f..4fb0a0c 100755
--- a/madgraph/madweight/mod_file.py
+++ b/madgraph/madweight/mod_file.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python 
+#!/usr/bin/env python2
 ####################################################################################################
 ####################################################################################################
 ##                                                                                                ##
diff --git a/madgraph/madweight/substructure_class.py b/madgraph/madweight/substructure_class.py
index 370ee1f..3affadf 100755
--- a/madgraph/madweight/substructure_class.py
+++ b/madgraph/madweight/substructure_class.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python2
 
 
 try:
diff --git a/madgraph/madweight/verif_event.py b/madgraph/madweight/verif_event.py
index 0882a96..224d17a 100755
--- a/madgraph/madweight/verif_event.py
+++ b/madgraph/madweight/verif_event.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python2
 ##########################################################################
 ##                                                                      ##
 ##                               MadWeight                              ##
diff --git a/madgraph/madweight/write_MadWeight.py b/madgraph/madweight/write_MadWeight.py
index f7a9a6f..4cf5fac 100755
--- a/madgraph/madweight/write_MadWeight.py
+++ b/madgraph/madweight/write_MadWeight.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python2
 ##### -*- coding: cp1252 -*-
 
 #Extension
diff --git a/madgraph/various/combine_plots.py b/madgraph/various/combine_plots.py
index 34311e4..474ae00 100755
--- a/madgraph/various/combine_plots.py
+++ b/madgraph/various/combine_plots.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python2
 ################################################################################
 #
 # Copyright (c) 2013 The MadGraph5_aMC@NLO Development team and Contributors
diff --git a/madgraph/various/histograms.py b/madgraph/various/histograms.py
index 6ad5fd7..8d2874c 100755
--- a/madgraph/various/histograms.py
+++ b/madgraph/various/histograms.py
@@ -1,4 +1,4 @@
-#! /usr/bin/env python
+#!/usr/bin/env python2
 ################################################################################
 #
 # Copyright (c) 2010 The MadGraph5_aMC@NLO Development team and Contributors
diff --git a/madgraph/various/plot_djrs.py b/madgraph/various/plot_djrs.py
index c0fb743..30fcfbc 100644
--- a/madgraph/various/plot_djrs.py
+++ b/madgraph/various/plot_djrs.py
@@ -1,4 +1,4 @@
-#! /usr/bin/env python
+#!/usr/bin/env python2
 ################################################################################
 #
 # Copyright (c) 2010 The MadGraph5_aMC@NLO Development team and Contributors
diff --git a/madgraph/various/progressbar.py b/madgraph/various/progressbar.py
index 2f1bc4d..eaeae7d 100755
--- a/madgraph/various/progressbar.py
+++ b/madgraph/various/progressbar.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/env python2
 # -*- coding: iso-8859-1 -*-
 #
 # progressbar  - Text progressbar library for python.
diff --git a/tests/acceptance_tests/test_histograms.py b/tests/acceptance_tests/test_histograms.py
index 82239bf..b7d61fd 100755
--- a/tests/acceptance_tests/test_histograms.py
+++ b/tests/acceptance_tests/test_histograms.py
@@ -47,5 +47,5 @@ class IOTest_Histogram(IOTests.IOTestManager):
           histo_list.output(pjoin('%s','HistoOut'), format = 'gnuplot');
         ''' % (sys.path, _file_path, self.IOpath)
 
-        os.system('echo "%s" | python' % line) 
+        os.system('echo "%s" | python2' % line) 
 
diff --git a/tests/acceptance_tests/test_model_equivalence.py b/tests/acceptance_tests/test_model_equivalence.py
index 37e93bd..e7b063d 100755
--- a/tests/acceptance_tests/test_model_equivalence.py
+++ b/tests/acceptance_tests/test_model_equivalence.py
@@ -322,7 +322,7 @@ class TestModelCreation(unittest.TestCase, CheckFileCreate):
             pass
         # prepare for a local compilation
         
-        subprocess.call(['python','write_param_card.py'], cwd=os.path.join(MG5DIR,'models','sm'),
+        subprocess.call(['python2','write_param_card.py'], cwd=os.path.join(MG5DIR,'models','sm'),
                         stdout=subprocess.PIPE)
         files.cp(os.path.join(MG5DIR,'models','sm','param_card.dat'),
                  join('param_card.dat'))
diff --git a/tests/parallel_tests/loop_sample_script.py b/tests/parallel_tests/loop_sample_script.py
index 1ee58f4..4fc64b5 100755
--- a/tests/parallel_tests/loop_sample_script.py
+++ b/tests/parallel_tests/loop_sample_script.py
@@ -1,4 +1,4 @@
-#! /usr/bin/env python
+#!/usr/bin/env python2
 ################################################################################
 #
 # Copyright (c) 2009 The MadGraph5_aMC@NLO Development team and Contributors
diff --git a/tests/parallel_tests/sample_script.py b/tests/parallel_tests/sample_script.py
index 2be23d9..ff11bf9 100755
--- a/tests/parallel_tests/sample_script.py
+++ b/tests/parallel_tests/sample_script.py
@@ -1,4 +1,4 @@
-#! /usr/bin/env python
+#!/usr/bin/env python2
 ################################################################################
 #
 # Copyright (c) 2009 The MadGraph5_aMC@NLO Development team and Contributors
diff --git a/tests/test_manager.py b/tests/test_manager.py
index 9518cf5..75d154a 100755
--- a/tests/test_manager.py
+++ b/tests/test_manager.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python 
+#!/usr/bin/env python2
 ################################################################################
 #
 # Copyright (c) 2009 The MadGraph5_aMC@NLO Development team and Contributors
@@ -1092,6 +1092,6 @@ https://cp3.irmp.ucl.ac.be/projects/madgraph/wiki/DevelopmentPage/CodeTesting
 #    run('TestTestFinder')
 #    run('test_check_valid_on_file')
 #    run('test_collect_dir.*') # '.*' stands for all possible char (re format)
-#    python tests/test_manager.py test_decay.py -l INFO|less
+#    python2 tests/test_manager.py test_decay.py -l INFO|less
 
 
diff --git a/vendor/IREGI/src/oneloop/create.py b/vendor/IREGI/src/oneloop/create.py
index 43290c5..ea98b6f 100755
--- a/vendor/IREGI/src/oneloop/create.py
+++ b/vendor/IREGI/src/oneloop/create.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python2
 import re,string,os,sys,subprocess
 locdir,thisFile = os.path.split(os.path.abspath(sys.argv[0]))
 srcdir = os.path.join(locdir,'src')
diff --git a/vendor/IREGI/src/oneloop/example_cpp/create.py b/vendor/IREGI/src/oneloop/example_cpp/create.py
index fca7438..820cce8 100755
--- a/vendor/IREGI/src/oneloop/example_cpp/create.py
+++ b/vendor/IREGI/src/oneloop/example_cpp/create.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python2
 import re,string,os,sys,subprocess
 locdir,thisFile = os.path.split(os.path.abspath(sys.argv[0]))
 srcdir = os.path.join(locdir,'src')
diff --git a/vendor/IREGI/src/oneloop/src/avh_olo.py b/vendor/IREGI/src/oneloop/src/avh_olo.py
index 438f55a..6ec087a 100755
--- a/vendor/IREGI/src/oneloop/src/avh_olo.py
+++ b/vendor/IREGI/src/oneloop/src/avh_olo.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python2
 import re,sys
 import avh_pc_olo
 
@@ -25,14 +25,14 @@ for option in sysargv:
     elif re.match(r'cppintf',option): cppintf = re.sub(r'cppintf=','',option) 
     else:
         avh_pc.prnt('')
-        avh_pc.prnt('usage: python avh_pc_olo.py [dpkind="kind"]')
-        avh_pc.prnt('                            [qpkind="kind"]')
-        avh_pc.prnt('                            [kindmod="module"]')
-        avh_pc.prnt('                            [ddtype="type"]')
-        avh_pc.prnt('                            [qdtype="type"]')
-        avh_pc.prnt('                            [mptype="type"]')
-        avh_pc.prnt('                            [tlevel="yes"]')
-        avh_pc.prnt('                            [cppintf="yes"]')
+        avh_pc.prnt('usage: python2 avh_pc_olo.py [dpkind="kind"]')
+        avh_pc.prnt('                             [qpkind="kind"]')
+        avh_pc.prnt('                             [kindmod="module"]')
+        avh_pc.prnt('                             [ddtype="type"]')
+        avh_pc.prnt('                             [qdtype="type"]')
+        avh_pc.prnt('                             [mptype="type"]')
+        avh_pc.prnt('                             [tlevel="yes"]')
+        avh_pc.prnt('                             [cppintf="yes"]')
         avh_pc.prnt('       If no option is provided, dpkind="kind(1d0)" is set')
         avh_pc.prnt('       by default. However, dpkind must be provided expli-')
         avh_pc.prnt('       citly if to be combined with qpkind and/or mptype.')
diff --git a/vendor/IREGI/src/oneloop/src/avh_pc_exe.py b/vendor/IREGI/src/oneloop/src/avh_pc_exe.py
index 150e4c0..f372e43 100755
--- a/vendor/IREGI/src/oneloop/src/avh_pc_exe.py
+++ b/vendor/IREGI/src/oneloop/src/avh_pc_exe.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python2
 
 import sys
 import avh_pc