STINNER Victor added the comment:
strbytes.patch of #27134: adding calls to
PyThreadState_GetDict()+PyDict_GetItemString() seems inefficient for a rare use
case
I would prefer to modify the existing Py_BytesWarningFlag flag.
The flag is process-wide. If it's an issue, we can use a thread-local storage
(TLS) for the flag in C.
FYI get_exec_path() uses the following code to temporarely ignore the warning:
# {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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<http://bugs.python.org/issue18373>
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