As locale coercion occurs before the command line arguments are processed,

setting ``PYTHONCOERCECLOCALE=0`` will prevent locale coercion even when

``PYTHONCOERCECLOCALE=warn`` case is handled later, and respects those

options as usual (i.e. no locale coercion warnings will ever be displayed

.. versionadded:: 3.7

See :pep:`538` for more details. Note that the 3.7 implementation differs

from the PEP in a few key aspects due to some unintended interactions

with the :pep:`540` implementation: 1) ``LC_ALL=C`` must be used to

specified (``PYTHONCOERCECLOCALE=0`` won't work); 2) calling

:c:func:`Py_Initialize` in an embedding application will trigger locale

coercion when running in the C locale; 2) calling :c:func:`Py_Main` in

the approach described in :pep:`538`: calling :c:func:`Py_Initialize` and

:c:func:`Py_Main` will never implicitly trigger local coercion, and

``PYTHONCOERCECLOCALE=0`` takes effect even when the :option:`-E` or

.. envvar:: PYTHONDEVMODE