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Warns about incorrect gettext usage.

Project description

Flake8 i18n plugin

Way too often using gettext in python results in one of the following errors:


Not only gettext will not work here because fstring interpolation happens before function call, but using gettext tools for collecting translation keys results in:

File “/usr/lib/python3.6/site-packages/babel/messages/”,

line 480, in extract_python value = eval(code, {‘__builtins__’: {}}, {})

File “<string>”, line 2, in <module> NameError: name ‘context_variable’ is not defined

Similar cases are

_(“%s” % value)



which will not trigger a collection error, but will still result in an incorrect key name in gettext function call.

This flake8 extensions provides basic checks for the above cases.


Install with pip:

$ pip install flake8-i18n


Add following into your .flake8 file

i18nfuncs =

gettext ngettext myfunny_gettext _

Otherwise the default function name list is

gettext ngettext _

Using string interpolation inside gettext will now result in one of the following:

I001 fstring is resolved before function call

I002 format is resolved before function call

I003 printf is resolved before function call


  • Python 3.6, 3.7

  • flake8


GNU General Public License v2 (GPLv2)


0.1.0 (2019-03-02)

  • Basic implementation

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