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Dir : //proc/self/root/opt/alt/python37/lib/python3.7/site-packages/pkg_resources/extern/__init__.py

import importlib.util
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 _module_matches_namespace(self, fullname):
        """Figure out if the target module is vendored."""
        root, base, target = fullname.partition(self.root_name + '.')
        return not root and any(map(target.startswith, self.vendored_names))

    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
                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 create_module(self, spec):
        return self.load_module(spec.name)

    def exec_module(self, module):
        pass

    def find_spec(self, fullname, path=None, target=None):
        """Return a module spec for vendored names."""
        return (
            importlib.util.spec_from_loader(fullname, self)
            if self._module_matches_namespace(fullname) else None
        )

    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', 'appdirs'
VendorImporter(__name__, names).install()