def ByteSize(self):
    'Returns the serialized size of this message.\n\n    Recursively calls ByteSize() on all contained messages.\n\n    Returns:\n      int: The number of bytes required to serialize this message.\n    '
    raise NotImplementedError
Returns the serialized size of this message.

Recursively calls ByteSize() on all contained messages.

Returns:
  int: The number of bytes required to serialize this message.
def ByteSize(self):
    'Returns the serialized size of this message.\n\n    Recursively calls ByteSize() on all contained messages.\n\n    Returns:\n      int: The number of bytes required to serialize this message.\n    '
    raise NotImplementedError