commands.py 文件源码

def _decode_property(string):
  """Decodes a general key-value property from a command line argument."""
  m = PROPERTY_RE.match(string)
  if not m:
    raise argparse.ArgumentTypeError(
        'Invalid property: "%s". Must have the form "name=value" or '
        '"(type)name=value".', string)
  _, type_str, name, value_str = m.groups()
  if type_str is None:
    # Guess numeric types automatically.
    try:
      value = _decode_number(value_str)
    except argparse.ArgumentTypeError:
      value = value_str
  elif type_str == TYPE_DATE:
    value = _decode_date(value_str)
  elif type_str == TYPE_NUMBER:
    value = _decode_number(value_str)
  elif type_str == TYPE_STRING:
    value = value_str
  else:
    raise argparse.ArgumentTypeError(
        'Unrecognized property type name: "%s". Expected one of "string", '
        '"number", "date", or a prefix.' % type_str)
  return (name, value)