feedparser.py 文件源码

def __init__(self, _factory=None, *, policy=compat32):
        """_factory is called with no arguments to create a new message obj

        The policy keyword specifies a policy object that controls a number of
        aspects of the parser's operation.  The default policy maintains
        backward compatibility.

        """
        self.policy = policy
        self._factory_kwds = lambda: {'policy': self.policy}
        if _factory is None:
            # What this should be:
            #self._factory = policy.default_message_factory
            # but, because we are post 3.4 feature freeze, fix with temp hack:
            if self.policy is compat32:
                self._factory = message.Message
            else:
                self._factory = message.EmailMessage
        else:
            self._factory = _factory
            try:
                _factory(policy=self.policy)
            except TypeError:
                # Assume this is an old-style factory
                self._factory_kwds = lambda: {}
        self._input = BufferedSubFile()
        self._msgstack = []
        self._parse = self._parsegen().__next__
        self._cur = None
        self._last = None
        self._headersonly = False

    # Non-public interface for supporting Parser's headersonly flag