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/lib/python3.6/site-packages/pkg_resources/extern/__init__.py

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import sys

class VendorImporter:
    """
    A PEP 302 meta path importer for finding optionally-vendored
    or otherwise naturally-installed packages from root_name.
    """

def __init__(self, root_name, vendored_names=(), vendor_pkg=None):
        self.root_name = root_name
        self.vendored_names = set(vendored_names)
        self.vendor_pkg = vendor_pkg or root_name.replace('extern', '_vendor')

@property
    def search_path(self):
        """
        Search first the vendor package then as a natural package.
        """
        yield self.vendor_pkg + '.'
        yield ''

def find_module(self, fullname, path=None):
        """
        Return self when fullname starts with root_name and the
        target module is one vendored through this importer.
        """
        root, base, target = fullname.partition(self.root_name + '.')
        if root:
            return
        if not any(map(target.startswith, self.vendored_names)):
            return
        return self

def load_module(self, fullname):
        """
        Iterate over the search path to locate and load fullname.
        """
        root, base, target = fullname.partition(self.root_name + '.')
        for prefix in self.search_path:
            try:
                extant = prefix + target
                __import__(extant)
                mod = sys.modules[extant]
                sys.modules[fullname] = mod
                # mysterious hack:
                # Remove the reference to the extant package/module
                # on later Python versions to cause relative imports
                # in the vendor package to resolve the same modules
                # as those going through this importer.
                if sys.version_info > (3, 3):
                    del sys.modules[extant]
                return mod
            except ImportError:
                pass
        else:
            raise ImportError(
                "The '{target}' package is required; "
                "normally this is bundled with this package so if you get "
                "this warning, consult the packager of your "
                "distribution.".format(**locals())
            )

def install(self):
        """
        Install this importer into sys.meta_path if not already present.
        """
        if self not in sys.meta_path:
            sys.meta_path.append(self)

names = 'packaging', 'pyparsing', 'six', 'appdirs'
VendorImporter(__name__, names).install()

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