def load(self, filename, create_if_missing=True):
        filename = Path(filename)
        if not filename.exists() and create_if_missing:
            self.load_pip_requirements()
            with filename.open("w") as f:
                f.write(yaml.dump(self.serialized, default_flow_style=False,
                                  encoding=None))
            self.filename = filename
            return self.save(filename)
        with filename.open() as f:
            for group, requirements in yaml.load(f.read()).items():
                for requirement in requirements:
                    self[group].add(Requirement.coerce(requirement))
        self.filename = filename
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