def fromString(klass, url):
        """
        Make a L{URLPath} from a L{str} or L{unicode}.

        @param url: A L{str} representation of a URL.
        @type url: L{str} or L{unicode}.

        @return: a new L{URLPath} derived from the given string.
        @rtype: L{URLPath}
        """
        if not isinstance(url, (str, unicode)):
            raise ValueError("'url' must be a str or unicode")
        if isinstance(url, bytes):
            # On Python 2, accepting 'str' (for compatibility) means we might
            # get 'bytes'.  On py3, this will not work with bytes due to the
            # check above.
            return klass.fromBytes(url)
        return klass._fromURL(_URL.fromText(url))

        Make a L{URLPath} from a L{str} or L{unicode}.

        @param url: A L{str} representation of a URL.
        @type url: L{str} or L{unicode}.

        @return: a new L{URLPath} derived from the given string.
        @rtype: L{URLPath}
        
stackoverflow/venv/lib/python3.6/site-packages/twisted/python/urlpath.py