def create_vendor_txt_map():
    # type: () -> Dict[str, str]
    vendor_txt_path = os.path.join(
        os.path.dirname(pip_location),
        '_vendor',
        'vendor.txt'
    )

    with open(vendor_txt_path) as f:
        # Purge non version specifying lines.
        # Also, remove any space prefix or suffixes (including comments).
        lines = [line.strip().split(' ', 1)[0]
                 for line in f.readlines() if '==' in line]

    # Transform into "module" -> version dict.
    return dict(line.split('==', 1) for line in lines)  # type: ignore 

def get_module_from_module_name(module_name):
    # type: (str) -> ModuleType

    # Module name can be uppercase in vendor.txt for some reason...
    module_name = module_name.lower()
    # PATCH: setuptools is actually only pkg_resources.
    if module_name == 'setuptools':
        module_name = 'pkg_resources'

    __import__(
        'pip._vendor.{}'.format(module_name),
        globals(),
        locals(),
        level=0
    )
    return getattr(pip._vendor, module_name) 

def run(self, options, args):
        # type: (Values, List[Any]) -> int
        logger.warning(
            "This command is only meant for debugging. "
            "Do not use this with automation for parsing and getting these "
            "details, since the output and options of this command may "
            "change without notice."
        )
        show_value('pip version', get_pip_version())
        show_value('sys.version', sys.version)
        show_value('sys.executable', sys.executable)
        show_value('sys.getdefaultencoding', sys.getdefaultencoding())
        show_value('sys.getfilesystemencoding', sys.getfilesystemencoding())
        show_value(
            'locale.getpreferredencoding', locale.getpreferredencoding(),
        )
        show_value('sys.platform', sys.platform)
        show_sys_implementation()

        show_value("'cert' config value", ca_bundle_info(self.parser.config))
        show_value("REQUESTS_CA_BUNDLE", os.environ.get('REQUESTS_CA_BUNDLE'))
        show_value("CURL_CA_BUNDLE", os.environ.get('CURL_CA_BUNDLE'))
        show_value("pip._vendor.certifi.where()", where())
        show_value("pip._vendor.DEBUNDLED", pip._vendor.DEBUNDLED)

        show_vendor_versions()

        show_tags(options)

        return SUCCESS