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"""Append module search paths for third-party packages to sys.path.
* This module is automatically imported during initialization. *
In earlier versions of Python (up to 1.5a3), scripts or modules that
needed to use site-specific modules would place ``import site''
somewhere near the top of their code. Because of the automatic
import, this is no longer necessary (but code that does it still
This will append site-specific paths to to the module search path. On
Unix, it starts with sys.prefix and sys.exec_prefix (if different) and
appends lib/python<version>/site-packages as well as lib/site-python.
On other platforms (mainly Mac and Windows), it uses just sys.prefix
(and sys.exec_prefix, if different, but this is unlikely). The
resulting directories, if they exist, are appended to sys.path, and
also inspected for path configuration files.
FOR DEBIAN, this sys.path is augmented with directories in /usr/local.
Local addons go into /usr/local/lib/python<version>/site-packages
(resp. /usr/local/lib/site-python), Debian addons install into
A path configuration file is a file whose name has the form
<package>.pth; its contents are additional directories (one per line)
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
/usr/local and there is a directory /usr/local/lib/python2.3/site-packages
with three subdirectories, foo, bar and spam, and two path
configuration files, foo.pth and bar.pth. Assume foo.pth contains the
# foo package configuration
and bar.pth contains:
# bar package configuration
Then the following directories are added to sys.path, in this order:
Note that bletch is omitted because it doesn't exist; bar precedes foo
because bar.pth comes alphabetically before foo.pth; and spam is
omitted because it is not mentioned in either path configuration file.
After these path manipulations, an attempt is made to import a module
named sitecustomize, which can perform arbitrary additional
site-specific customizations. If this import fails with an
ImportError exception, it is silently ignored.
import sys, os
def makepath(*paths):
dir = os.path.abspath(os.path.join(*paths))
return dir, os.path.normcase(dir)
for m in sys.modules.values():
if hasattr(m, "__file__") and m.__file__:
m.__file__ = os.path.abspath(m.__file__)
del m
# This ensures that the initial path provided by the interpreter contains
# only absolute pathnames, even if we're running from the build directory.
L = []
_dirs_in_sys_path = {}
dir = dircase = None # sys.path may be empty at this point
for dir in sys.path:
# Filter out duplicate paths (on case-insensitive file systems also
# if they only differ in case); turn relative paths into absolute
# paths.
dir, dircase = makepath(dir)
if not dircase in _dirs_in_sys_path:
_dirs_in_sys_path[dircase] = 1
sys.path[:] = L
del dir, dircase, L
# Append ./build/lib.<platform> in case we're running in the build dir
# (especially for Guido :-)
# XXX This should not be part of, since it is needed even when
# using the -S option for Python. See
if ( == "posix" and sys.path and
os.path.basename(sys.path[-1]) == "Modules"):
from distutils.util import get_platform
s = "build/lib.%s-%.3s" % (get_platform(), sys.version)
s = os.path.join(os.path.dirname(sys.path[-1]), s)
del get_platform, s
def _init_pathinfo():
global _dirs_in_sys_path
_dirs_in_sys_path = d = {}
for dir in sys.path:
if dir and not os.path.isdir(dir):
dir, dircase = makepath(dir)
d[dircase] = 1
def addsitedir(sitedir):
global _dirs_in_sys_path
if _dirs_in_sys_path is None:
reset = 1
reset = 0
sitedir, sitedircase = makepath(sitedir)
if not sitedircase in _dirs_in_sys_path:
sys.path.append(sitedir) # Add path component
names = os.listdir(sitedir)
except os.error:
for name in names:
if name[-4:] == os.extsep + "pth":
addpackage(sitedir, name)
if reset:
_dirs_in_sys_path = None
def addpackage(sitedir, name):
global _dirs_in_sys_path
if _dirs_in_sys_path is None:
reset = 1
reset = 0
fullname = os.path.join(sitedir, name)
f = open(fullname)
except IOError:
while 1:
dir = f.readline()
if not dir:
if dir[0] == '#':
if dir.startswith("import"):
exec dir
if dir[-1] == '\n':
dir = dir[:-1]
dir, dircase = makepath(sitedir, dir)
if not dircase in _dirs_in_sys_path and os.path.exists(dir):
_dirs_in_sys_path[dircase] = 1
if reset:
_dirs_in_sys_path = None
prefixes = [os.path.join(sys.prefix, "local"), sys.prefix]
sitedir = None # make sure sitedir is initialized because of later 'del'
if sys.exec_prefix != sys.prefix:
prefixes.append(os.path.join(sys.exec_prefix, "local"))
for prefix in prefixes:
if prefix:
if sys.platform in ('os2emx', 'riscos'):
sitedirs = [os.path.join(prefix, "Lib", "site-packages")]
elif os.sep == '/':
sitedirs = [os.path.join(prefix,
"python" + sys.version[:3],
os.path.join(prefix, "lib", "site-python")]
sitedirs = [prefix, os.path.join(prefix, "lib", "site-packages")]
if sys.platform == 'darwin':
# for framework builds *only* we add the standard Apple
# locations. Currently only per-user, but /Library and
# /Network/Library could be added too
if 'Python.framework' in prefix:
home = os.environ.get('HOME')
if home:
for sitedir in sitedirs:
if os.path.isdir(sitedir):
del prefix, sitedir
_dirs_in_sys_path = None
# Define new built-ins 'quit' and 'exit'.
# These are simply strings that display a hint on how to exit.
if os.sep == ':':
exit = 'Use Cmd-Q to quit.'
elif os.sep == '\\':
exit = 'Use Ctrl-Z plus Return to exit.'
exit = 'Use Ctrl-D (i.e. EOF) to exit.'
import __builtin__
__builtin__.quit = __builtin__.exit = exit
del exit
# interactive prompt objects for printing the license text, a list of
# contributors and the copyright notice.
class _Printer:
def __init__(self, name, data, files=(), dirs=()):
self.__name = name
self.__data = data
self.__files = files
self.__dirs = dirs
self.__lines = None
def __setup(self):
if self.__lines:
data = None
for dir in self.__dirs:
for file in self.__files:
file = os.path.join(dir, file)
fp = open(file)
data =
except IOError:
if data:
if not data:
data = self.__data
self.__lines = data.split('\n')
self.__linecnt = len(self.__lines)
def __repr__(self):
if len(self.__lines) <= self.MAXLINES:
return "\n".join(self.__lines)
return "Type %s() to see the full %s text" % ((self.__name,)*2)
def __call__(self):
prompt = 'Hit Return for more, or q (and Return) to quit: '
lineno = 0
while 1:
for i in range(lineno, lineno + self.MAXLINES):
print self.__lines[i]
except IndexError:
lineno += self.MAXLINES
key = None
while key is None:
key = raw_input(prompt)
if key not in ('', 'q'):
key = None
if key == 'q':
__builtin__.copyright = _Printer("copyright", sys.copyright)
if sys.platform[:4] == 'java':
__builtin__.credits = _Printer(
"Jython is maintained by the Jython developers (")
__builtin__.credits = _Printer("credits", """\
Thanks to CWI, CNRI,, Zope Corporation and a cast of thousands
for supporting Python development. See for more information.""")
here = os.path.dirname(os.__file__)
__builtin__.license = _Printer(
"license", "See" % sys.version,
[os.path.join(here, os.pardir), here, os.curdir])
# Define new built-in 'help'.
# This is a wrapper around (with a twist).
class _Helper:
def __repr__(self):
return "Type help() for interactive help, " \
"or help(object) for help about object."
def __call__(self, *args, **kwds):
import pydoc
return*args, **kwds) = _Helper()
# On Windows, some default encodings are not provided
# by Python (e.g. "cp932" in Japanese locale), while they
# are always available as "mbcs" in each locale.
# Make them usable by aliasing to "mbcs" in such a case.
if sys.platform == 'win32':
import locale, codecs
enc = locale.getdefaultlocale()[1]
if enc.startswith('cp'): # "cp***" ?
except LookupError:
import encodings
encodings._cache[enc] = encodings._unknown
encodings.aliases.aliases[enc] = 'mbcs'
# Set the string encoding used by the Unicode implementation. The
# default is 'ascii', but if you're willing to experiment, you can
# change this.
encoding = "ascii" # Default value set by _PyUnicode_Init()
if 0:
# Enable to support locale aware default string encodings.
import locale
loc = locale.getdefaultlocale()
if loc[1]:
encoding = loc[1]
if 0:
# Enable to switch off string to Unicode coercion and implicit
# Unicode to string conversion.
encoding = "undefined"
if encoding != "ascii":
# On Non-Unicode builds this will raise an AttributeError...
sys.setdefaultencoding(encoding) # Needs Python Unicode build !
# Run custom site specific code, if available.
import sitecustomize
except ImportError:
# Remove sys.setdefaultencoding() so that users cannot change the
# encoding after initialization. The test for presence is needed when
# this module is run as a script, because this code is executed twice.
if hasattr(sys, "setdefaultencoding"):
del sys.setdefaultencoding
def _test():
print "sys.path = ["
for dir in sys.path:
print " %s," % `dir`
print "]"
if __name__ == '__main__':