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122 lines
4 KiB
Python
122 lines
4 KiB
Python
"""Append module search paths for third-party packages to sys.path.
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****************************************************************
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* This module is automatically imported during initialization. *
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****************************************************************
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In earlier versions of Python (up to 1.5a3), scripts or modules that
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needed to use site-specific modules would place ``import site''
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somewhere near the top of their code. Because of the automatic
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import, this is no longer necessary (but code that does it still
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works).
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This will append site-specific paths to to the module search path. On
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Unix, it starts with sys.prefix and sys.exec_prefix (if different) and
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appends lib/python<version>/site-packages as well as lib/site-python.
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On other platforms (mainly Mac and Windows), it uses just sys.prefix
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(and sys.exec_prefix, if different, but this is unlikely). The
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resulting directories, if they exist, are appended to sys.path, and
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also inspected for path configuration files.
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A path configuration file is a file whose name has the form
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<package>.pth; its contents are additional directories (one per line)
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to be added to sys.path. Non-existing directories (or
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non-directories) are never added to sys.path; no directory is added to
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sys.path more than once. Blank lines and lines beginning with
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\code{#} are skipped.
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For example, suppose sys.prefix and sys.exec_prefix are set to
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/usr/local and there is a directory /usr/local/python1.5/site-packages
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with three subdirectories, foo, bar and spam, and two path
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configuration files, foo.pth and bar.pth. Assume foo.pth contains the
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following:
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# foo package configuration
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foo
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bar
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bletch
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and bar.pth contains:
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# bar package configuration
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bar
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Then the following directories are added to sys.path, in this order:
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/usr/local/lib/python1.5/site-packages/bar
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/usr/local/lib/python1.5/site-packages/foo
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Note that bletch is omitted because it doesn't exist; bar precedes foo
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because bar.pth comes alphabetically before foo.pth; and spam is
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omitted because it is not mentioned in either path configuration file.
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After these path manipulations, an attempt is made to import a module
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named sitecustomize, which can perform arbitrary additional
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site-specific customizations. If this import fails with an
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ImportError exception, it is silently ignored.
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"""
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import sys, os
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def addsitedir(sitedir):
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if sitedir not in sys.path:
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sys.path.append(sitedir) # Add path component
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try:
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names = os.listdir(sitedir)
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except os.error:
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return
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names = map(os.path.normcase, names)
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names.sort()
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for name in names:
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if name[-4:] == ".pth":
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addpackage(sitedir, name)
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def addpackage(sitedir, name):
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fullname = os.path.join(sitedir, name)
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try:
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f = open(fullname)
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except IOError:
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return
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while 1:
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dir = f.readline()
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if not dir:
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break
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if dir[0] == '#':
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continue
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if dir[-1] == '\n':
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dir = dir[:-1]
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dir = os.path.join(sitedir, dir)
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if dir not in sys.path and os.path.exists(dir):
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sys.path.append(dir)
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prefixes = [sys.prefix]
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if sys.exec_prefix != sys.prefix:
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prefixes.append(sys.exec_prefix)
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for prefix in prefixes:
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if prefix:
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if os.sep == '/':
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sitedirs = [os.path.join(prefix,
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"lib",
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"python" + sys.version[:3],
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"site-packages"),
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os.path.join(prefix, "lib", "site-python")]
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else:
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sitedirs = [prefix]
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for sitedir in sitedirs:
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if os.path.isdir(sitedir):
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addsitedir(sitedir)
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try:
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import sitecustomize # Run arbitrary site specific code
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except ImportError:
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pass # No site customization module
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def _test():
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print "sys.path = ["
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for dir in sys.path:
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print " %s," % `dir`
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print "]"
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if __name__ == '__main__':
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_test()
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