mirror of
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09cad08d75
default encoding ("ascii") is changed. This safes quite a few cycles
during startup since the first call to .setdefaultencoding() will
initialize the codec registry and the encodings package.
See python-dev for a discussion (Subject: "[Python-Dev] [comp.lang.python] sys.setdefaultencoding (2.0b1)").
217 lines
6.4 KiB
Python
217 lines
6.4 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/lib/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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# Define new built-ins 'quit' and 'exit'.
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# These are simply strings that display a hint on how to exit.
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if os.sep == ':':
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exit = 'Use Cmd-Q to quit.'
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elif os.sep == '\\':
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exit = 'Use Ctrl-Z plus Return to exit.'
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else:
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exit = 'Use Ctrl-D (i.e. EOF) to exit.'
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import __builtin__
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__builtin__.quit = __builtin__.exit = exit
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del exit
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# interactive prompt objects for printing the license text, a list of
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# contributors and the copyright notice.
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class _Printer:
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MAXLINES = 23
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def __init__(self, s):
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self.__lines = s.split('\n')
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self.__linecnt = len(self.__lines)
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def __repr__(self):
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prompt = 'Hit Return for more, or q (and Return) to quit: '
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lineno = 0
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while 1:
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try:
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for i in range(lineno, lineno + self.MAXLINES):
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print self.__lines[i]
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except IndexError:
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break
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else:
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lineno += self.MAXLINES
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key = None
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while key is None:
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key = raw_input(prompt)
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if key not in ('', 'q'):
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key = None
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if key == 'q':
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break
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return ''
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__builtin__.copyright = _Printer(sys.copyright)
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__builtin__.credits = _Printer(
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'''Python development is led by BeOpen PythonLabs (www.pythonlabs.com).''')
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def make_license(filename):
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try:
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return _Printer(open(filename).read())
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except IOError:
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return None
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here = os.path.dirname(os.__file__)
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for dir in here, os.path.join(here, os.pardir), os.curdir:
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for file in "LICENSE.txt", "LICENSE":
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lic = make_license(os.path.join(dir, file))
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if lic:
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break
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if lic:
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__builtin__.license = lic
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break
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else:
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__builtin__.license = _Printer('See http://hdl.handle.net/1895.22/1012')
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# Set the string encoding used by the Unicode implementation. The
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# default is 'ascii', but if you're willing to experiment, you can
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# change this.
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encoding = "ascii" # Default value set by _PyUnicode_Init()
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if 0:
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# Enable to support locale aware default string encodings.
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import locale
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loc = locale.getdefaultlocale()
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if loc[1]:
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encoding = loc[1]
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if 0:
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# Enable to switch off string to Unicode coercion and implicit
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# Unicode to string conversion.
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encoding = "undefined"
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if encoding != "ascii":
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sys.setdefaultencoding(encoding)
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#
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# Run custom site specific code, if available.
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#
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try:
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import sitecustomize
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except ImportError:
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pass
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#
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# Remove sys.setdefaultencoding() so that users cannot change the
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# encoding after initialization.
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#
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del sys.setdefaultencoding
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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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