cpython/Lib/site.py

"""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 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(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__.open = 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()