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tox, in version 2, no longer passes environment variables from the calling environment. This causes problems, because the
LANG
environment variable is how Python attempts to figure out the locale, and defaults to ASCII. TheREADME.rst
file has utf-8 characters, and is read in thesetup.py
.This means that right now this package cannot be installed under tox 2 with Python 3, unless tox is configured to pass that environment variable from the context.
Running the tests on Travis CI isn't catching this, because this problem doesn't show up without a limited environment, like we get from tox.