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 _wait_for_license_pool_state_to_activate(self, pool):
        error_values = ['EXPIRED', 'FAILED']
        # Wait no more than 5 minutes
        for x in range(1, 30):
            pool.refresh()
            if pool.state == 'LICENSED':
                return True
            elif pool.state == 'WAITING_FOR_EULA_ACCEPTANCE':
                pool.modify(
                    eulaText=pool.eulaText,
                    state='ACCEPTED_EULA'
                )
            elif pool.state in error_values:
                raise F5ModuleError(pool.errorText)
            time.sleep(10)