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Document Py_GETENV() (#3890)

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Doc/c-api/intro.rst
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......@@ -132,6 +132,11 @@ complete listing.
Argument must be a character or an integer in the range [-128, 127] or [0,
255]. This macro returns ``c`` cast to an ``unsigned char``.
.. c:macro:: Py_GETENV(s)
Like ``getenv(s)``, but returns *NULL* if :option:`-E` was passed on the
command line (i.e. if ``Py_IgnoreEnvironmentFlag`` is set).
.. _api-objects:
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