Github user vmarkovtsev commented on the pull request:
https://github.com/apache/thrift/pull/972#issuecomment-204311613
``flake8 --ignore=E501 lib/py`` in Travis failed because the syntax "yield
from" is Python 3.3+ and flake [does not support
it](https://gitlab.com/pycqa/flake8/issues/53).
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