STINNER Victor added the comment:
On Python 3, comparison between str and bytes raises a BytesWarning exception
if python3 is started with -bb. But sometimes, you really want to compare str
with bytes. For example, os.get_exec_path() changes temporarely the
BytesWarning warning for that!
# {b'PATH': ...}.get('PATH') and {'PATH': ...}.get(b'PATH') emit a
# BytesWarning when using python -b or python -bb: ignore the warning
with warnings.catch_warnings():
warnings.simplefilter("ignore", BytesWarning)
...
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue27077>
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