Lines length should not exceed 120 characters. Please use trailing commas.
You can find our complete flake8 configuration in the tox.ini file.
Every Python source file should be encoded as UTF-8. As per PEP 263, the first or the second line must be:
For each data set, please provide a comment with reference to the source and/or origin of the data. We only accept datasets coming from statistical sources, such as census or government institutions.
When you have long lists of names, please order them alphabetically. Keep the lines length as close as possible to 120 characters, without exceeding the limit.