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 exists(self):
        collection = self.client.api.cm.shared.licensing.pools_s.get_collection(
            requests_params=dict(
                params="$filter=name+eq+'{0}'".format(self.want.name)
            )
        )
        if len(collection) == 1:
            return True
        elif len(collection) == 0:
            return False
        else:
            raise F5ModuleError(
                "Multiple license pools with the provided name were found!"
            )