| """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 builtins |
| |
| |
| 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 set(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): |
| """Process a .pth file within the site-packages directory: |
| For each line in the file, either combine it with sitedir to a path |
| and add that to known_paths, or execute it 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 ") or line.startswith("import\t"): |
| 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(".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 == 'os2emx': |
| 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) |
| builtins.quit = Quitter('quit') |
| builtins.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 builtins""" |
| builtins.copyright = _Printer("copyright", sys.copyright) |
| if sys.platform[:4] == 'java': |
| builtins.credits = _Printer( |
| "credits", |
| "Jython is maintained by the Jython developers (www.jython.org).") |
| else: |
| builtins.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__) |
| builtins.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(): |
| builtins.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 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() |
| 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() |