def _parse_parameterized_format(self):
    format_name = self._tokenizer.next()
    self._validate_string(format_name)

    arguments = {}

    if self._tokenizer.consume_if('('):
      arguments = self._parse_format_parameters()
      self._tokenizer.consume(')')

    self._add_format(format_name, arguments)
Parses parameterized_format.
dataset/ETHPy150Open AppScale/appscale/AppServer/google/appengine/ext/mapreduce/file_format_parser.py/_Parser._parse_parameterized_format