options.py 文件源码

def _parse_url(self, url):
        """
        Downloads and parses a URL, returns xml root.

        """
        try:
            from lxml.html import parse
        except ImportError: # pragma: no cover
            raise ImportError("Please install lxml if you want to use the "
                              "{0!r} class".format(self.__class__.__name__))
        doc = parse(self._read_url_as_StringIO(url))
        root = doc.getroot()
        if root is None: # pragma: no cover
            raise RemoteDataError("Parsed URL {0!r} has no root"
                                      "element".format(url))
        return root