def load(self, requirements_file=None):
        """Load or reload requirements from a requirements.txt file.

        :param requirements_file: if not given, the filename used from
            initialization will be read again.
        """
        if requirements_file is None:
            requirements_file = self.filename
            if requirements_file is None:
                raise ValueError("no filename provided")
        elif isinstance(requirements_file, text_type):
            requirements_file = Path(requirements_file)
        self.clear()
        with requirements_file.open() as f:
            self.loads(f.read())

        if isinstance(requirements_file, (text_type, Path)):
            self.filename = requirements_file
def __eq__(self, other):
        if isinstance(other, self.__class__):
            return (self.glen == other.glen and
                    self.saddr == other.gaddr and
                    self.saddr == other.saddr)
        elif (hasattr(other, "grp_address_length") and
              hasattr(other, "grp_address") and
              hasattr(other, "src_address")):
            # vl_api_mprefix_t
            if 4 == self.version:
                return (self.glen == other.grp_address_length and
                        self.gaddr == str(other.grp_address.ip4) and
                        self.saddr == str(other.src_address.ip4))
            else:
                return (self.glen == other.grp_address_length and
                        self.gaddr == str(other.grp_address.ip6) and
                        self.saddr == str(other.src_address.ip6))
        return NotImplemented