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On other platforms (such as Windows), it tries each of the
prefixes directly, as well as with lib/site-packages appended.  The
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If a file named "pyvenv.cfg" exists one directory above sys.executable,
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it is also checked for site-packages (sys.base_prefix and
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searched for site-packages; otherwise they won't.

All of the resulting site-specific directories, if they exist, are
appended to sys.path, and also inspected for path configuration
files.

A path configuration file is a file whose name has the form
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to be added to sys.path.  Non-existing directories (or
non-directories) are never added to sys.path; no directory is added to
sys.path more than once.  Blank lines and lines beginning with
'#' are skipped. Lines starting with 'import' are executed.

For example, suppose sys.prefix and sys.exec_prefix are set to
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following:

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and bar.pth contains:

  # bar package configuration
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Then the following directories are added to sys.path, in this order:

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  /usr/local/lib/python2.5/site-packages/foo

Note that bletch is omitted because it doesn't exist; bar precedes foo
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omitted because it is not mentioned in either path configuration file.

The readline module is also automatically configured to enable
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sitecustomize, usercustomize or PYTHONSTARTUP.

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