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Edit File : pkgutil.py \| Size : 19.77 KB
"""Utilities to support packages.""" import os import sys import imp import os.path from types import ModuleType __all__ = [ 'get_importer', 'iter_importers', 'get_loader', 'find_loader', 'walk_packages', 'iter_modules', 'get_data', 'ImpImporter', 'ImpLoader', 'read_code', 'extend_path', ] def read_code(stream): # This helper is needed in order for the PEP 302 emulation to # correctly handle compiled files import marshal magic = stream.read(4) if magic != imp.get_magic(): return None stream.read(4) # Skip timestamp return marshal.load(stream) def simplegeneric(func): """Make a trivial single-dispatch generic function""" registry = {} def wrapper(args, kw): ob = args[0] try: cls = ob.__class__ except AttributeError: cls = type(ob) try: mro = cls.__mro__ except AttributeError: try: class cls(cls, object): pass mro = cls.__mro__[1:] except TypeError: mro = object, # must be an ExtensionClass or some such :( for t in mro: if t in registry: return registry[t](args, *kw) else: return func(args, *kw) try: wrapper.__name__ = func.__name__ except (TypeError, AttributeError): pass # Python 2.3 doesn't allow functions to be renamed def register(typ, func=None): if func is None: return lambda f: register(typ, f) registry[typ] = func return func wrapper.__dict__ = func.__dict__ wrapper.__doc__ = func.__doc__ wrapper.register = register return wrapper def walk_packages(path=None, prefix='', onerror=None): """Yields (module_loader, name, ispkg) for all modules recursively on path, or, if path is None, all accessible modules. 'path' should be either None or a list of paths to look for modules in. 'prefix' is a string to output on the front of every module name on output. Note that this function must import all packages* (NOT all modules!) on the given path, in order to access the __path__ attribute to find submodules. 'onerror' is a function which gets called with one argument (the name of the package which was being imported) if any exception occurs while trying to import a package. If no onerror function is supplied, ImportErrors are caught and ignored, while all other exceptions are propagated, terminating the search. Examples: # list all modules python can access walk_packages() # list all submodules of ctypes walk_packages(ctypes.__path__, ctypes.__name__+'.') """ def seen(p, m={}): if p in m: return True m[p] = True for importer, name, ispkg in iter_modules(path, prefix): yield importer, name, ispkg if ispkg: try: __import__(name) except ImportError: if onerror is not None: onerror(name) except Exception: if onerror is not None: onerror(name) else: raise else: path = getattr(sys.modules[name], '__path__', None) or [] # don't traverse path items we've seen before path = [p for p in path if not seen(p)] for item in walk_packages(path, name+'.', onerror): yield item def iter_modules(path=None, prefix=''): """Yields (module_loader, name, ispkg) for all submodules on path, or, if path is None, all top-level modules on sys.path. 'path' should be either None or a list of paths to look for modules in. 'prefix' is a string to output on the front of every module name on output. """ if path is None: importers = iter_importers() else: importers = map(get_importer, path) yielded = {} for i in importers: for name, ispkg in iter_importer_modules(i, prefix): if name not in yielded: yielded[name] = 1 yield i, name, ispkg #@simplegeneric def iter_importer_modules(importer, prefix=''): if not hasattr(importer, 'iter_modules'): return [] return importer.iter_modules(prefix) iter_importer_modules = simplegeneric(iter_importer_modules) class ImpImporter: """PEP 302 Importer that wraps Python's "classic" import algorithm ImpImporter(dirname) produces a PEP 302 importer that searches that directory. ImpImporter(None) produces a PEP 302 importer that searches the current sys.path, plus any modules that are frozen or built-in. Note that ImpImporter does not currently support being used by placement on sys.meta_path. """ def __init__(self, path=None): self.path = path def find_module(self, fullname, path=None): # Note: we ignore 'path' argument since it is only used via meta_path subname = fullname.split(".")[-1] if subname != fullname and self.path is None: return None if self.path is None: path = None else: path = [os.path.realpath(self.path)] try: file, filename, etc = imp.find_module(subname, path) except ImportError: return None return ImpLoader(fullname, file, filename, etc) def iter_modules(self, prefix=''): if self.path is None or not os.path.isdir(self.path): return yielded = {} import inspect try: filenames = os.listdir(self.path) except OSError: # ignore unreadable directories like import does filenames = [] filenames.sort() # handle packages before same-named modules for fn in filenames: modname = inspect.getmodulename(fn) if modname=='__init__' or modname in yielded: continue path = os.path.join(self.path, fn) ispkg = False if not modname and os.path.isdir(path) and '.' not in fn: modname = fn try: dircontents = os.listdir(path) except OSError: # ignore unreadable directories like import does dircontents = [] for fn in dircontents: subname = inspect.getmodulename(fn) if subname=='__init__': ispkg = True break else: continue # not a package if modname and '.' not in modname: yielded[modname] = 1 yield prefix + modname, ispkg class ImpLoader: """PEP 302 Loader that wraps Python's "classic" import algorithm """ code = source = None def __init__(self, fullname, file, filename, etc): self.file = file self.filename = filename self.fullname = fullname self.etc = etc def load_module(self, fullname): self._reopen() try: mod = imp.load_module(fullname, self.file, self.filename, self.etc) finally: if self.file: self.file.close() # Note: we don't set __loader__ because we want the module to look # normal; i.e. this is just a wrapper for standard import machinery return mod def get_data(self, pathname): with open(pathname, "rb") as file: return file.read() def _reopen(self): if self.file and self.file.closed: mod_type = self.etc[2] if mod_type==imp.PY_SOURCE: self.file = open(self.filename, 'rU') elif mod_type in (imp.PY_COMPILED, imp.C_EXTENSION): self.file = open(self.filename, 'rb') def _fix_name(self, fullname): if fullname is None: fullname = self.fullname elif fullname != self.fullname: raise ImportError("Loader for module %s cannot handle " "module %s" % (self.fullname, fullname)) return fullname def is_package(self, fullname): fullname = self._fix_name(fullname) return self.etc[2]==imp.PKG_DIRECTORY def get_code(self, fullname=None): fullname = self._fix_name(fullname) if self.code is None: mod_type = self.etc[2] if mod_type==imp.PY_SOURCE: source = self.get_source(fullname) self.code = compile(source, self.filename, 'exec') elif mod_type==imp.PY_COMPILED: self._reopen() try: self.code = read_code(self.file) finally: self.file.close() elif mod_type==imp.PKG_DIRECTORY: self.code = self._get_delegate().get_code() return self.code def get_source(self, fullname=None): fullname = self._fix_name(fullname) if self.source is None: mod_type = self.etc[2] if mod_type==imp.PY_SOURCE: self._reopen() try: self.source = self.file.read() finally: self.file.close() elif mod_type==imp.PY_COMPILED: if os.path.exists(self.filename[:-1]): f = open(self.filename[:-1], 'rU') self.source = f.read() f.close() elif mod_type==imp.PKG_DIRECTORY: self.source = self._get_delegate().get_source() return self.source def _get_delegate(self): return ImpImporter(self.filename).find_module('__init__') def get_filename(self, fullname=None): fullname = self._fix_name(fullname) mod_type = self.etc[2] if self.etc[2]==imp.PKG_DIRECTORY: return self._get_delegate().get_filename() elif self.etc[2] in (imp.PY_SOURCE, imp.PY_COMPILED, imp.C_EXTENSION): return self.filename return None try: import zipimport from zipimport import zipimporter def iter_zipimport_modules(importer, prefix=''): dirlist = zipimport._zip_directory_cache[importer.archive].keys() dirlist.sort() _prefix = importer.prefix plen = len(_prefix) yielded = {} import inspect for fn in dirlist: if not fn.startswith(_prefix): continue fn = fn[plen:].split(os.sep) if len(fn)==2 and fn[1].startswith('__init__.py'): if fn[0] not in yielded: yielded[fn[0]] = 1 yield fn[0], True if len(fn)!=1: continue modname = inspect.getmodulename(fn[0]) if modname=='__init__': continue if modname and '.' not in modname and modname not in yielded: yielded[modname] = 1 yield prefix + modname, False iter_importer_modules.register(zipimporter, iter_zipimport_modules) except ImportError: pass def get_importer(path_item): """Retrieve a PEP 302 importer for the given path item The returned importer is cached in sys.path_importer_cache if it was newly created by a path hook. If there is no importer, a wrapper around the basic import machinery is returned. This wrapper is never inserted into the importer cache (None is inserted instead). The cache (or part of it) can be cleared manually if a rescan of sys.path_hooks is necessary. """ try: importer = sys.path_importer_cache[path_item] except KeyError: for path_hook in sys.path_hooks: try: importer = path_hook(path_item) break except ImportError: pass else: importer = None sys.path_importer_cache.setdefault(path_item, importer) if importer is None: try: importer = ImpImporter(path_item) except ImportError: importer = None return importer def iter_importers(fullname=""): """Yield PEP 302 importers for the given module name If fullname contains a '.', the importers will be for the package containing fullname, otherwise they will be importers for sys.meta_path, sys.path, and Python's "classic" import machinery, in that order. If the named module is in a package, that package is imported as a side effect of invoking this function. Non PEP 302 mechanisms (e.g. the Windows registry) used by the standard import machinery to find files in alternative locations are partially supported, but are searched AFTER sys.path. Normally, these locations are searched BEFORE sys.path, preventing sys.path entries from shadowing them. For this to cause a visible difference in behaviour, there must be a module or package name that is accessible via both sys.path and one of the non PEP 302 file system mechanisms. In this case, the emulation will find the former version, while the builtin import mechanism will find the latter. Items of the following types can be affected by this discrepancy: imp.C_EXTENSION, imp.PY_SOURCE, imp.PY_COMPILED, imp.PKG_DIRECTORY """ if fullname.startswith('.'): raise ImportError("Relative module names not supported") if '.' in fullname: # Get the containing package's __path__ pkg = '.'.join(fullname.split('.')[:-1]) if pkg not in sys.modules: __import__(pkg) path = getattr(sys.modules[pkg], '__path__', None) or [] else: for importer in sys.meta_path: yield importer path = sys.path for item in path: yield get_importer(item) if '.' not in fullname: yield ImpImporter() def get_loader(module_or_name): """Get a PEP 302 "loader" object for module_or_name If the module or package is accessible via the normal import mechanism, a wrapper around the relevant part of that machinery is returned. Returns None if the module cannot be found or imported. If the named module is not already imported, its containing package (if any) is imported, in order to establish the package __path__. This function uses iter_importers(), and is thus subject to the same limitations regarding platform-specific special import locations such as the Windows registry. """ if module_or_name in sys.modules: module_or_name = sys.modules[module_or_name] if isinstance(module_or_name, ModuleType): module = module_or_name loader = getattr(module, '__loader__', None) if loader is not None: return loader fullname = module.__name__ else: fullname = module_or_name return find_loader(fullname) def find_loader(fullname): """Find a PEP 302 "loader" object for fullname If fullname contains dots, path must be the containing package's __path__. Returns None if the module cannot be found or imported. This function uses iter_importers(), and is thus subject to the same limitations regarding platform-specific special import locations such as the Windows registry. """ for importer in iter_importers(fullname): loader = importer.find_module(fullname) if loader is not None: return loader return None def extend_path(path, name): """Extend a package's path. Intended use is to place the following code in a package's __init__.py: from pkgutil import extend_path __path__ = extend_path(__path__, __name__) This will add to the package's __path__ all subdirectories of directories on sys.path named after the package. This is useful if one wants to distribute different parts of a single logical package as multiple directories. It also looks for .pkg files beginning where matches the name argument. This feature is similar to .pth files (see site.py), except that it doesn't special-case lines starting with 'import'. A .pkg file is trusted at face value: apart from checking for duplicates, all entries found in a .pkg file are added to the path, regardless of whether they are exist the filesystem. (This is a feature.) If the input path is not a list (as is the case for frozen packages) it is returned unchanged. The input path is not modified; an extended copy is returned. Items are only appended to the copy at the end. It is assumed that sys.path is a sequence. Items of sys.path that are not (unicode or 8-bit) strings referring to existing directories are ignored. Unicode items of sys.path that cause errors when used as filenames may cause this function to raise an exception (in line with os.path.isdir() behavior). """ if not isinstance(path, list): # This could happen e.g. when this is called from inside a # frozen package. Return the path unchanged in that case. return path pname = os.path.join(name.split('.')) # Reconstitute as relative path # Just in case os.extsep != '.' sname = os.extsep.join(name.split('.')) sname_pkg = sname + os.extsep + "pkg" init_py = "__init__" + os.extsep + "py" path = path[:] # Start with a copy of the existing path for dir in sys.path: if not isinstance(dir, basestring) or not os.path.isdir(dir): continue subdir = os.path.join(dir, pname) # XXX This may still add duplicate entries to path on # case-insensitive filesystems initfile = os.path.join(subdir, init_py) if subdir not in path and os.path.isfile(initfile): path.append(subdir) # XXX Is this the right thing for subpackages like zope.app? # It looks for a file named "zope.app.pkg" pkgfile = os.path.join(dir, sname_pkg) if os.path.isfile(pkgfile): try: f = open(pkgfile) except IOError, msg: sys.stderr.write("Can't open %s: %s\n" % (pkgfile, msg)) else: for line in f: line = line.rstrip('\n') if not line or line.startswith('#'): continue path.append(line) # Don't check for existence! f.close() return path def get_data(package, resource): """Get a resource from a package. This is a wrapper round the PEP 302 loader get_data API. The package argument should be the name of a package, in standard module format (foo.bar). The resource argument should be in the form of a relative filename, using '/' as the path separator. The parent directory name '..' is not allowed, and nor is a rooted name (starting with a '/'). The function returns a binary string, which is the contents of the specified resource. For packages located in the filesystem, which have already been imported, this is the rough equivalent of d = os.path.dirname(sys.modules[package].__file__) data = open(os.path.join(d, resource), 'rb').read() If the package cannot be located or loaded, or it uses a PEP 302 loader which does not support get_data(), then None is returned. """ loader = get_loader(package) if loader is None or not hasattr(loader, 'get_data'): return None mod = sys.modules.get(package) or loader.load_module(package) if mod is None or not hasattr(mod, '__file__'): return None # Modify the resource name to be compatible with the loader.get_data # signature - an os.path format "filename" starting with the dirname of # the package's __file__ parts = resource.split('/') parts.insert(0, os.path.dirname(mod.__file__)) resource_name = os.path.join(*parts) return loader.get_data(resource_name) Back

Edit File : pkgutil.py | Size : 19.77 KB

"""Utilities to support packages."""

import os
import sys
import imp
import os.path
from types import ModuleType

__all__ = [
    'get_importer', 'iter_importers', 'get_loader', 'find_loader',
    'walk_packages', 'iter_modules', 'get_data',
    'ImpImporter', 'ImpLoader', 'read_code', 'extend_path',
]

def read_code(stream):
    # This helper is needed in order for the PEP 302 emulation to
    # correctly handle compiled files
    import marshal

magic = stream.read(4)
    if magic != imp.get_magic():
        return None

stream.read(4) # Skip timestamp
    return marshal.load(stream)

def simplegeneric(func):
    """Make a trivial single-dispatch generic function"""
    registry = {}
    def wrapper(*args, **kw):
        ob = args[0]
        try:
            cls = ob.__class__
        except AttributeError:
            cls = type(ob)
        try:
            mro = cls.__mro__
        except AttributeError:
            try:
                class cls(cls, object):
                    pass
                mro = cls.__mro__[1:]
            except TypeError:
                mro = object,   # must be an ExtensionClass or some such  :(
        for t in mro:
            if t in registry:
                return registry[t](*args, **kw)
        else:
            return func(*args, **kw)
    try:
        wrapper.__name__ = func.__name__
    except (TypeError, AttributeError):
        pass    # Python 2.3 doesn't allow functions to be renamed

def register(typ, func=None):
        if func is None:
            return lambda f: register(typ, f)
        registry[typ] = func
        return func

wrapper.__dict__ = func.__dict__
    wrapper.__doc__ = func.__doc__
    wrapper.register = register
    return wrapper

def walk_packages(path=None, prefix='', onerror=None):
    """Yields (module_loader, name, ispkg) for all modules recursively
    on path, or, if path is None, all accessible modules.

'path' should be either None or a list of paths to look for
    modules in.

'prefix' is a string to output on the front of every module name
    on output.

Note that this function must import all *packages* (NOT all
    modules!) on the given path, in order to access the __path__
    attribute to find submodules.

'onerror' is a function which gets called with one argument (the
    name of the package which was being imported) if any exception
    occurs while trying to import a package.  If no onerror function is
    supplied, ImportErrors are caught and ignored, while all other
    exceptions are propagated, terminating the search.

Examples:

# list all modules python can access
    walk_packages()

# list all submodules of ctypes
    walk_packages(ctypes.__path__, ctypes.__name__+'.')
    """

def seen(p, m={}):
        if p in m:
            return True
        m[p] = True

for importer, name, ispkg in iter_modules(path, prefix):
        yield importer, name, ispkg

if ispkg:
            try:
                __import__(name)
            except ImportError:
                if onerror is not None:
                    onerror(name)
            except Exception:
                if onerror is not None:
                    onerror(name)
                else:
                    raise
            else:
                path = getattr(sys.modules[name], '__path__', None) or []

# don't traverse path items we've seen before
                path = [p for p in path if not seen(p)]

for item in walk_packages(path, name+'.', onerror):
                    yield item

def iter_modules(path=None, prefix=''):
    """Yields (module_loader, name, ispkg) for all submodules on path,
    or, if path is None, all top-level modules on sys.path.

'path' should be either None or a list of paths to look for
    modules in.

'prefix' is a string to output on the front of every module name
    on output.
    """

if path is None:
        importers = iter_importers()
    else:
        importers = map(get_importer, path)

yielded = {}
    for i in importers:
        for name, ispkg in iter_importer_modules(i, prefix):
            if name not in yielded:
                yielded[name] = 1
                yield i, name, ispkg

#@simplegeneric
def iter_importer_modules(importer, prefix=''):
    if not hasattr(importer, 'iter_modules'):
        return []
    return importer.iter_modules(prefix)

iter_importer_modules = simplegeneric(iter_importer_modules)

class ImpImporter:
    """PEP 302 Importer that wraps Python's "classic" import algorithm

ImpImporter(dirname) produces a PEP 302 importer that searches that
    directory.  ImpImporter(None) produces a PEP 302 importer that searches
    the current sys.path, plus any modules that are frozen or built-in.

Note that ImpImporter does not currently support being used by placement
    on sys.meta_path.
    """

def __init__(self, path=None):
        self.path = path

def find_module(self, fullname, path=None):
        # Note: we ignore 'path' argument since it is only used via meta_path
        subname = fullname.split(".")[-1]
        if subname != fullname and self.path is None:
            return None
        if self.path is None:
            path = None
        else:
            path = [os.path.realpath(self.path)]
        try:
            file, filename, etc = imp.find_module(subname, path)
        except ImportError:
            return None
        return ImpLoader(fullname, file, filename, etc)

def iter_modules(self, prefix=''):
        if self.path is None or not os.path.isdir(self.path):
            return

yielded = {}
        import inspect
        try:
            filenames = os.listdir(self.path)
        except OSError:
            # ignore unreadable directories like import does
            filenames = []
        filenames.sort()  # handle packages before same-named modules

for fn in filenames:
            modname = inspect.getmodulename(fn)
            if modname=='__init__' or modname in yielded:
                continue

path = os.path.join(self.path, fn)
            ispkg = False

if not modname and os.path.isdir(path) and '.' not in fn:
                modname = fn
                try:
                    dircontents = os.listdir(path)
                except OSError:
                    # ignore unreadable directories like import does
                    dircontents = []
                for fn in dircontents:
                    subname = inspect.getmodulename(fn)
                    if subname=='__init__':
                        ispkg = True
                        break
                else:
                    continue    # not a package

if modname and '.' not in modname:
                yielded[modname] = 1
                yield prefix + modname, ispkg

class ImpLoader:
    """PEP 302 Loader that wraps Python's "classic" import algorithm
    """
    code = source = None

def __init__(self, fullname, file, filename, etc):
        self.file = file
        self.filename = filename
        self.fullname = fullname
        self.etc = etc

def load_module(self, fullname):
        self._reopen()
        try:
            mod = imp.load_module(fullname, self.file, self.filename, self.etc)
        finally:
            if self.file:
                self.file.close()
        # Note: we don't set __loader__ because we want the module to look
        # normal; i.e. this is just a wrapper for standard import machinery
        return mod

def get_data(self, pathname):
        with open(pathname, "rb") as file:
            return file.read()

def _reopen(self):
        if self.file and self.file.closed:
            mod_type = self.etc[2]
            if mod_type==imp.PY_SOURCE:
                self.file = open(self.filename, 'rU')
            elif mod_type in (imp.PY_COMPILED, imp.C_EXTENSION):
                self.file = open(self.filename, 'rb')

def _fix_name(self, fullname):
        if fullname is None:
            fullname = self.fullname
        elif fullname != self.fullname:
            raise ImportError("Loader for module %s cannot handle "
                              "module %s" % (self.fullname, fullname))
        return fullname

def is_package(self, fullname):
        fullname = self._fix_name(fullname)
        return self.etc[2]==imp.PKG_DIRECTORY

def get_code(self, fullname=None):
        fullname = self._fix_name(fullname)
        if self.code is None:
            mod_type = self.etc[2]
            if mod_type==imp.PY_SOURCE:
                source = self.get_source(fullname)
                self.code = compile(source, self.filename, 'exec')
            elif mod_type==imp.PY_COMPILED:
                self._reopen()
                try:
                    self.code = read_code(self.file)
                finally:
                    self.file.close()
            elif mod_type==imp.PKG_DIRECTORY:
                self.code = self._get_delegate().get_code()
        return self.code

def get_source(self, fullname=None):
        fullname = self._fix_name(fullname)
        if self.source is None:
            mod_type = self.etc[2]
            if mod_type==imp.PY_SOURCE:
                self._reopen()
                try:
                    self.source = self.file.read()
                finally:
                    self.file.close()
            elif mod_type==imp.PY_COMPILED:
                if os.path.exists(self.filename[:-1]):
                    f = open(self.filename[:-1], 'rU')
                    self.source = f.read()
                    f.close()
            elif mod_type==imp.PKG_DIRECTORY:
                self.source = self._get_delegate().get_source()
        return self.source

def _get_delegate(self):
        return ImpImporter(self.filename).find_module('__init__')

def get_filename(self, fullname=None):
        fullname = self._fix_name(fullname)
        mod_type = self.etc[2]
        if self.etc[2]==imp.PKG_DIRECTORY:
            return self._get_delegate().get_filename()
        elif self.etc[2] in (imp.PY_SOURCE, imp.PY_COMPILED, imp.C_EXTENSION):
            return self.filename
        return None

try:
    import zipimport
    from zipimport import zipimporter

def iter_zipimport_modules(importer, prefix=''):
        dirlist = zipimport._zip_directory_cache[importer.archive].keys()
        dirlist.sort()
        _prefix = importer.prefix
        plen = len(_prefix)
        yielded = {}
        import inspect
        for fn in dirlist:
            if not fn.startswith(_prefix):
                continue

fn = fn[plen:].split(os.sep)

if len(fn)==2 and fn[1].startswith('__init__.py'):
                if fn[0] not in yielded:
                    yielded[fn[0]] = 1
                    yield fn[0], True

if len(fn)!=1:
                continue

modname = inspect.getmodulename(fn[0])
            if modname=='__init__':
                continue

if modname and '.' not in modname and modname not in yielded:
                yielded[modname] = 1
                yield prefix + modname, False

iter_importer_modules.register(zipimporter, iter_zipimport_modules)

except ImportError:
    pass

def get_importer(path_item):
    """Retrieve a PEP 302 importer for the given path item

The returned importer is cached in sys.path_importer_cache
    if it was newly created by a path hook.

If there is no importer, a wrapper around the basic import
    machinery is returned. This wrapper is never inserted into
    the importer cache (None is inserted instead).

The cache (or part of it) can be cleared manually if a
    rescan of sys.path_hooks is necessary.
    """
    try:
        importer = sys.path_importer_cache[path_item]
    except KeyError:
        for path_hook in sys.path_hooks:
            try:
                importer = path_hook(path_item)
                break
            except ImportError:
                pass
        else:
            importer = None
        sys.path_importer_cache.setdefault(path_item, importer)

if importer is None:
        try:
            importer = ImpImporter(path_item)
        except ImportError:
            importer = None
    return importer

def iter_importers(fullname=""):
    """Yield PEP 302 importers for the given module name

If fullname contains a '.', the importers will be for the package
    containing fullname, otherwise they will be importers for sys.meta_path,
    sys.path, and Python's "classic" import machinery, in that order.  If
    the named module is in a package, that package is imported as a side
    effect of invoking this function.

Non PEP 302 mechanisms (e.g. the Windows registry) used by the
    standard import machinery to find files in alternative locations
    are partially supported, but are searched AFTER sys.path. Normally,
    these locations are searched BEFORE sys.path, preventing sys.path
    entries from shadowing them.

For this to cause a visible difference in behaviour, there must
    be a module or package name that is accessible via both sys.path
    and one of the non PEP 302 file system mechanisms. In this case,
    the emulation will find the former version, while the builtin
    import mechanism will find the latter.

Items of the following types can be affected by this discrepancy:
        imp.C_EXTENSION, imp.PY_SOURCE, imp.PY_COMPILED, imp.PKG_DIRECTORY
    """
    if fullname.startswith('.'):
        raise ImportError("Relative module names not supported")
    if '.' in fullname:
        # Get the containing package's __path__
        pkg = '.'.join(fullname.split('.')[:-1])
        if pkg not in sys.modules:
            __import__(pkg)
        path = getattr(sys.modules[pkg], '__path__', None) or []
    else:
        for importer in sys.meta_path:
            yield importer
        path = sys.path
    for item in path:
        yield get_importer(item)
    if '.' not in fullname:
        yield ImpImporter()

def get_loader(module_or_name):
    """Get a PEP 302 "loader" object for module_or_name

If the module or package is accessible via the normal import
    mechanism, a wrapper around the relevant part of that machinery
    is returned.  Returns None if the module cannot be found or imported.
    If the named module is not already imported, its containing package
    (if any) is imported, in order to establish the package __path__.

This function uses iter_importers(), and is thus subject to the same
    limitations regarding platform-specific special import locations such
    as the Windows registry.
    """
    if module_or_name in sys.modules:
        module_or_name = sys.modules[module_or_name]
    if isinstance(module_or_name, ModuleType):
        module = module_or_name
        loader = getattr(module, '__loader__', None)
        if loader is not None:
            return loader
        fullname = module.__name__
    else:
        fullname = module_or_name
    return find_loader(fullname)

def find_loader(fullname):
    """Find a PEP 302 "loader" object for fullname

If fullname contains dots, path must be the containing package's __path__.
    Returns None if the module cannot be found or imported. This function uses
    iter_importers(), and is thus subject to the same limitations regarding
    platform-specific special import locations such as the Windows registry.
    """
    for importer in iter_importers(fullname):
        loader = importer.find_module(fullname)
        if loader is not None:
            return loader

return None

def extend_path(path, name):
    """Extend a package's path.

Intended use is to place the following code in a package's __init__.py:

from pkgutil import extend_path
        __path__ = extend_path(__path__, __name__)

This will add to the package's __path__ all subdirectories of
    directories on sys.path named after the package.  This is useful
    if one wants to distribute different parts of a single logical
    package as multiple directories.

It also looks for *.pkg files beginning where * matches the name
    argument.  This feature is similar to *.pth files (see site.py),
    except that it doesn't special-case lines starting with 'import'.
    A *.pkg file is trusted at face value: apart from checking for
    duplicates, all entries found in a *.pkg file are added to the
    path, regardless of whether they are exist the filesystem.  (This
    is a feature.)

If the input path is not a list (as is the case for frozen
    packages) it is returned unchanged.  The input path is not
    modified; an extended copy is returned.  Items are only appended
    to the copy at the end.

It is assumed that sys.path is a sequence.  Items of sys.path that
    are not (unicode or 8-bit) strings referring to existing
    directories are ignored.  Unicode items of sys.path that cause
    errors when used as filenames may cause this function to raise an
    exception (in line with os.path.isdir() behavior).
    """

if not isinstance(path, list):
        # This could happen e.g. when this is called from inside a
        # frozen package.  Return the path unchanged in that case.
        return path

pname = os.path.join(*name.split('.')) # Reconstitute as relative path
    # Just in case os.extsep != '.'
    sname = os.extsep.join(name.split('.'))
    sname_pkg = sname + os.extsep + "pkg"
    init_py = "__init__" + os.extsep + "py"

path = path[:] # Start with a copy of the existing path

for dir in sys.path:
        if not isinstance(dir, basestring) or not os.path.isdir(dir):
            continue
        subdir = os.path.join(dir, pname)
        # XXX This may still add duplicate entries to path on
        # case-insensitive filesystems
        initfile = os.path.join(subdir, init_py)
        if subdir not in path and os.path.isfile(initfile):
            path.append(subdir)
        # XXX Is this the right thing for subpackages like zope.app?
        # It looks for a file named "zope.app.pkg"
        pkgfile = os.path.join(dir, sname_pkg)
        if os.path.isfile(pkgfile):
            try:
                f = open(pkgfile)
            except IOError, msg:
                sys.stderr.write("Can't open %s: %s\n" %
                                 (pkgfile, msg))
            else:
                for line in f:
                    line = line.rstrip('\n')
                    if not line or line.startswith('#'):
                        continue
                    path.append(line) # Don't check for existence!
                f.close()

return path

def get_data(package, resource):
    """Get a resource from a package.

This is a wrapper round the PEP 302 loader get_data API. The package
    argument should be the name of a package, in standard module format
    (foo.bar). The resource argument should be in the form of a relative
    filename, using '/' as the path separator. The parent directory name '..'
    is not allowed, and nor is a rooted name (starting with a '/').

The function returns a binary string, which is the contents of the
    specified resource.

For packages located in the filesystem, which have already been imported,
    this is the rough equivalent of

d = os.path.dirname(sys.modules[package].__file__)
        data = open(os.path.join(d, resource), 'rb').read()

If the package cannot be located or loaded, or it uses a PEP 302 loader
    which does not support get_data(), then None is returned.
    """

loader = get_loader(package)
    if loader is None or not hasattr(loader, 'get_data'):
        return None
    mod = sys.modules.get(package) or loader.load_module(package)
    if mod is None or not hasattr(mod, '__file__'):
        return None

# Modify the resource name to be compatible with the loader.get_data
    # signature - an os.path format "filename" starting with the dirname of
    # the package's __file__
    parts = resource.split('/')
    parts.insert(0, os.path.dirname(mod.__file__))
    resource_name = os.path.join(*parts)
    return loader.get_data(resource_name)

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