There seems to be a bug with the Ukrainian currency code:
$ currency_converter usd uah 1
USD UAH
------ -------
1.0000 -1.0000
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Package Details: python3-currencyconverter 2017-3
| Git Clone URL: | https://aur.archlinux.org/python3-currencyconverter.git (read-only) |
|---|---|
| Package Base: | python3-currencyconverter |
| Description: | Module and command-line tool for currency conversion and rate retrieval. |
| Upstream URL: | http://xyne.archlinux.ca/projects/python3-currencyconverter |
| Keywords: | python |
| Licenses: | |
| Submitter: | Xyne |
| Maintainer: | Xyne |
| Last Packager: | Xyne |
| Votes: | 2 |
| Popularity: | 0.000000 |
| First Submitted: | 2012-12-24 16:55 |
| Last Updated: | 2017-01-07 01:48 |
It seems to work here:
$ currency_converter USD UAH 1000
USD UAH
--------- ----------
1000.0000 25130.0000
Whenver you get an error, check the website from which the rates are retrieved to make sure that it's up and that the currency codes are supported. Sometimes it just flakes out for a while.