457 lines
15 KiB
Python
457 lines
15 KiB
Python
"""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
|
|
works).
|
|
|
|
This will append site-specific paths to the module search path. On
|
|
Unix (including Mac OSX), 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 (such as Windows), it tries each of the
|
|
prefixes directly, as well as with lib/site-packages appended. The
|
|
resulting 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
|
|
<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/python2.5/site-packages
|
|
with three subdirectories, foo, bar and spam, and two path
|
|
configuration files, foo.pth and bar.pth. Assume foo.pth contains the
|
|
following:
|
|
|
|
# foo package configuration
|
|
foo
|
|
bar
|
|
bletch
|
|
|
|
and bar.pth contains:
|
|
|
|
# bar package configuration
|
|
bar
|
|
|
|
Then the following directories are added to sys.path, in this order:
|
|
|
|
/usr/local/lib/python2.5/site-packages/bar
|
|
/usr/local/lib/python2.5/site-packages/foo
|
|
|
|
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
|
|
import os
|
|
import __builtin__
|
|
|
|
|
|
def makepath(*paths):
|
|
dir = os.path.abspath(os.path.join(*paths))
|
|
return dir, os.path.normcase(dir)
|
|
|
|
def abs__file__():
|
|
"""Set all module' __file__ attribute to an absolute path"""
|
|
for m in sys.modules.values():
|
|
if hasattr(m, '__loader__'):
|
|
continue # don't mess with a PEP 302-supplied __file__
|
|
try:
|
|
m.__file__ = os.path.abspath(m.__file__)
|
|
except AttributeError:
|
|
continue
|
|
|
|
def removeduppaths():
|
|
""" Remove duplicate entries from sys.path along with making them
|
|
absolute"""
|
|
# This ensures that the initial path provided by the interpreter contains
|
|
# only absolute pathnames, even if we're running from the build directory.
|
|
L = []
|
|
known_paths = set()
|
|
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 known_paths:
|
|
L.append(dir)
|
|
known_paths.add(dircase)
|
|
sys.path[:] = L
|
|
return known_paths
|
|
|
|
# XXX This should not be part of site.py, since it is needed even when
|
|
# using the -S option for Python. See http://www.python.org/sf/586680
|
|
def addbuilddir():
|
|
"""Append ./build/lib.<platform> in case we're running in the build dir
|
|
(especially for Guido :-)"""
|
|
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)
|
|
sys.path.append(s)
|
|
|
|
def _init_pathinfo():
|
|
"""Return a set containing all existing directory entries from sys.path"""
|
|
d = set()
|
|
for dir in sys.path:
|
|
try:
|
|
if os.path.isdir(dir):
|
|
dir, dircase = makepath(dir)
|
|
d.add(dircase)
|
|
except TypeError:
|
|
continue
|
|
return d
|
|
|
|
def addpackage(sitedir, name, known_paths):
|
|
"""Add a new path to known_paths by combining sitedir and 'name' or execute
|
|
sitedir if it starts with 'import'"""
|
|
if known_paths is None:
|
|
_init_pathinfo()
|
|
reset = 1
|
|
else:
|
|
reset = 0
|
|
fullname = os.path.join(sitedir, name)
|
|
try:
|
|
f = open(fullname, "rU")
|
|
except IOError:
|
|
return
|
|
try:
|
|
for line in f:
|
|
if line.startswith("#"):
|
|
continue
|
|
if line.startswith("import"):
|
|
exec(line)
|
|
continue
|
|
line = line.rstrip()
|
|
dir, dircase = makepath(sitedir, line)
|
|
if not dircase in known_paths and os.path.exists(dir):
|
|
sys.path.append(dir)
|
|
known_paths.add(dircase)
|
|
finally:
|
|
f.close()
|
|
if reset:
|
|
known_paths = None
|
|
return known_paths
|
|
|
|
def addsitedir(sitedir, known_paths=None):
|
|
"""Add 'sitedir' argument to sys.path if missing and handle .pth files in
|
|
'sitedir'"""
|
|
if known_paths is None:
|
|
known_paths = _init_pathinfo()
|
|
reset = 1
|
|
else:
|
|
reset = 0
|
|
sitedir, sitedircase = makepath(sitedir)
|
|
if not sitedircase in known_paths:
|
|
sys.path.append(sitedir) # Add path component
|
|
try:
|
|
names = os.listdir(sitedir)
|
|
except os.error:
|
|
return
|
|
names.sort()
|
|
for name in names:
|
|
if name.endswith(os.extsep + "pth"):
|
|
addpackage(sitedir, name, known_paths)
|
|
if reset:
|
|
known_paths = None
|
|
return known_paths
|
|
|
|
def addsitepackages(known_paths):
|
|
"""Add site-packages (and possibly site-python) to sys.path"""
|
|
prefixes = [sys.prefix]
|
|
if sys.exec_prefix != sys.prefix:
|
|
prefixes.append(sys.exec_prefix)
|
|
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,
|
|
"lib",
|
|
"python" + sys.version[:3],
|
|
"site-packages"),
|
|
os.path.join(prefix, "lib", "site-python")]
|
|
else:
|
|
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:
|
|
sitedirs.append(
|
|
os.path.join(home,
|
|
'Library',
|
|
'Python',
|
|
sys.version[:3],
|
|
'site-packages'))
|
|
for sitedir in sitedirs:
|
|
if os.path.isdir(sitedir):
|
|
addsitedir(sitedir, known_paths)
|
|
return None
|
|
|
|
|
|
def setBEGINLIBPATH():
|
|
"""The OS/2 EMX port has optional extension modules that do double duty
|
|
as DLLs (and must use the .DLL file extension) for other extensions.
|
|
The library search path needs to be amended so these will be found
|
|
during module import. Use BEGINLIBPATH so that these are at the start
|
|
of the library search path.
|
|
|
|
"""
|
|
dllpath = os.path.join(sys.prefix, "Lib", "lib-dynload")
|
|
libpath = os.environ['BEGINLIBPATH'].split(';')
|
|
if libpath[-1]:
|
|
libpath.append(dllpath)
|
|
else:
|
|
libpath[-1] = dllpath
|
|
os.environ['BEGINLIBPATH'] = ';'.join(libpath)
|
|
|
|
|
|
def setquit():
|
|
"""Define new built-ins 'quit' and 'exit'.
|
|
These are simply strings that display a hint on how to exit.
|
|
|
|
"""
|
|
if os.sep == ':':
|
|
eof = 'Cmd-Q'
|
|
elif os.sep == '\\':
|
|
eof = 'Ctrl-Z plus Return'
|
|
else:
|
|
eof = 'Ctrl-D (i.e. EOF)'
|
|
|
|
class Quitter(object):
|
|
def __init__(self, name):
|
|
self.name = name
|
|
def __repr__(self):
|
|
return 'Use %s() or %s to exit' % (self.name, eof)
|
|
def __call__(self, code=None):
|
|
# Shells like IDLE catch the SystemExit, but listen when their
|
|
# stdin wrapper is closed.
|
|
try:
|
|
sys.stdin.close()
|
|
except:
|
|
pass
|
|
raise SystemExit(code)
|
|
__builtin__.quit = Quitter('quit')
|
|
__builtin__.exit = Quitter('exit')
|
|
|
|
|
|
class _Printer(object):
|
|
"""interactive prompt objects for printing the license text, a list of
|
|
contributors and the copyright notice."""
|
|
|
|
MAXLINES = 23
|
|
|
|
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:
|
|
return
|
|
data = None
|
|
for dir in self.__dirs:
|
|
for filename in self.__files:
|
|
filename = os.path.join(dir, filename)
|
|
try:
|
|
fp = open(filename, "rU")
|
|
data = fp.read()
|
|
fp.close()
|
|
break
|
|
except IOError:
|
|
pass
|
|
if data:
|
|
break
|
|
if not data:
|
|
data = self.__data
|
|
self.__lines = data.split('\n')
|
|
self.__linecnt = len(self.__lines)
|
|
|
|
def __repr__(self):
|
|
self.__setup()
|
|
if len(self.__lines) <= self.MAXLINES:
|
|
return "\n".join(self.__lines)
|
|
else:
|
|
return "Type %s() to see the full %s text" % ((self.__name,)*2)
|
|
|
|
def __call__(self):
|
|
self.__setup()
|
|
prompt = 'Hit Return for more, or q (and Return) to quit: '
|
|
lineno = 0
|
|
while 1:
|
|
try:
|
|
for i in range(lineno, lineno + self.MAXLINES):
|
|
print(self.__lines[i])
|
|
except IndexError:
|
|
break
|
|
else:
|
|
lineno += self.MAXLINES
|
|
key = None
|
|
while key is None:
|
|
sys.stdout.write(prompt)
|
|
sys.stdout.flush()
|
|
key = sys.stdin.readline()
|
|
if key not in ('', 'q'):
|
|
key = None
|
|
if key == 'q':
|
|
break
|
|
|
|
def setcopyright():
|
|
"""Set 'copyright' and 'credits' in __builtin__"""
|
|
__builtin__.copyright = _Printer("copyright", sys.copyright)
|
|
if sys.platform[:4] == 'java':
|
|
__builtin__.credits = _Printer(
|
|
"credits",
|
|
"Jython is maintained by the Jython developers (www.jython.org).")
|
|
else:
|
|
__builtin__.credits = _Printer("credits", """\
|
|
Thanks to CWI, CNRI, BeOpen.com, Zope Corporation and a cast of thousands
|
|
for supporting Python development. See www.python.org for more information.""")
|
|
here = os.path.dirname(os.__file__)
|
|
__builtin__.license = _Printer(
|
|
"license", "See http://www.python.org/%.3s/license.html" % sys.version,
|
|
["LICENSE.txt", "LICENSE"],
|
|
[os.path.join(here, os.pardir), here, os.curdir])
|
|
|
|
|
|
class _Helper(object):
|
|
"""Define the built-in 'help'.
|
|
This is a wrapper around pydoc.help (with a twist).
|
|
|
|
"""
|
|
|
|
def __repr__(self):
|
|
return "Type help() for interactive help, " \
|
|
"or help(object) for help about object."
|
|
def __call__(self, *args, **kwds):
|
|
import pydoc
|
|
return pydoc.help(*args, **kwds)
|
|
|
|
def sethelper():
|
|
__builtin__.help = _Helper()
|
|
|
|
def aliasmbcs():
|
|
"""On Windows, some default encodings are not provided by Python,
|
|
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***" ?
|
|
try:
|
|
codecs.lookup(enc)
|
|
except LookupError:
|
|
import encodings
|
|
encodings._cache[enc] = encodings._unknown
|
|
encodings.aliases.aliases[enc] = 'mbcs'
|
|
|
|
def setencoding():
|
|
"""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 !
|
|
|
|
|
|
def execsitecustomize():
|
|
"""Run custom site specific code, if available."""
|
|
try:
|
|
import sitecustomize
|
|
except ImportError:
|
|
pass
|
|
except Exception as err:
|
|
if os.environ.get("PYTHONVERBOSE"):
|
|
raise
|
|
sys.stderr.write(
|
|
"Error in sitecustomize; set PYTHONVERBOSE for traceback:\n"
|
|
"%s: %s\n" %
|
|
(err.__class__.__name__, err))
|
|
|
|
|
|
def installnewio():
|
|
"""Install new I/O library as default.
|
|
|
|
This is only done if $PYTHONNEWIO is set and non-empty.
|
|
"""
|
|
if not os.getenv("PYTHONNEWIO"):
|
|
return
|
|
import io
|
|
# Trick so that open won't become a bound method when stored
|
|
# as a class variable (as dumbdbm does)
|
|
class open:
|
|
def __new__(cls, *args, **kwds):
|
|
return io.open(*args, **kwds)
|
|
__builtin__.classic_open = __builtin__.open
|
|
__builtin__.classic_file = __builtin__.file
|
|
__builtin__.open = open
|
|
__builtin__.file = open
|
|
sys.stdin = io.open(0, "r")
|
|
sys.stdout = io.open(1, "w")
|
|
sys.stderr = io.open(2, "w")
|
|
|
|
|
|
def main():
|
|
abs__file__()
|
|
paths_in_sys = removeduppaths()
|
|
if (os.name == "posix" and sys.path and
|
|
os.path.basename(sys.path[-1]) == "Modules"):
|
|
addbuilddir()
|
|
paths_in_sys = addsitepackages(paths_in_sys)
|
|
if sys.platform == 'os2emx':
|
|
setBEGINLIBPATH()
|
|
setquit()
|
|
setcopyright()
|
|
sethelper()
|
|
aliasmbcs()
|
|
setencoding()
|
|
installnewio()
|
|
execsitecustomize()
|
|
# 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
|
|
|
|
main()
|
|
|
|
def _test():
|
|
print("sys.path = [")
|
|
for dir in sys.path:
|
|
print(" %r," % (dir,))
|
|
print("]")
|
|
|
|
if __name__ == '__main__':
|
|
_test()
|