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Jan 31, 2018
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Make site documentation more clear #5461

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14 changes: 8 additions & 6 deletions Doc/library/site.rst
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Expand Up @@ -97,20 +97,22 @@ not mentioned in either path configuration file.
After these path manipulations, an attempt is made to import a module named
:mod:`sitecustomize`, which can perform arbitrary site-specific customizations.
It is typically created by a system administrator in the site-packages
directory. If this import fails with an :exc:`ImportError` exception, it is
silently ignored. If Python is started without output streams available, as
directory. If this import fails with an :exc:`ImportError` or its subclass
exception, and the exception's :attr:`name` attribute equals to ``'sitecustomize'``,
it is silently ignored. If Python is started without output streams available, as
with :file:`pythonw.exe` on Windows (which is used by default to start IDLE),
attempted output from :mod:`sitecustomize` is ignored. Any exception other
than :exc:`ImportError` causes a silent and perhaps mysterious failure of the
process.
attempted output from :mod:`sitecustomize` is ignored. Any other exception
causes a silent and perhaps mysterious failure of the process.

.. index:: module: usercustomize

After this, an attempt is made to import a module named :mod:`usercustomize`,
which can perform arbitrary user-specific customizations, if
:data:`ENABLE_USER_SITE` is true. This file is intended to be created in the
user site-packages directory (see below), which is part of ``sys.path`` unless
disabled by :option:`-s`. An :exc:`ImportError` will be silently ignored.
disabled by :option:`-s`. If this import fails with an :exc:`ImportError` or
its subclass exception, and the exception's :attr:`name` attribute equals to
``'usercustomize'``, it is silently ignored.

Note that for some non-Unix systems, ``sys.prefix`` and ``sys.exec_prefix`` are
empty, and the path manipulations are skipped; however the import of
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