class_docstr: Abstract base class for protocol messages.
  
  Protocol message classes are almost always generated by the protocol
  compiler.  These generated types subclass Message and implement the methods
  shown below.
docstr: Serializes the protocol message to a binary string.
  
  This method is similar to SerializeToString but doesn't check if the
  message is initialized.
  
  Keyword Args:
    deterministic (bool): If true, requests deterministic serialization
      of the protobuf, with predictable ordering of map keys.
  
  Returns:
    bytes: A serialized representation of the partial message.
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code: def SerializePartialToString(self, **kwargs):
      """Serializes the protocol message to a binary string.
  
      This method is similar to SerializeToString but doesn't check if the
      message is initialized.
  
      Keyword Args:
        deterministic (bool): If true, requests deterministic serialization
          of the protobuf, with predictable ordering of map keys.
  
      Returns:
        bytes: A serialized representation of the partial message.
      """
      raise NotImplementedError
  
label_desc: Use image node_id 15 for calling the Message obj's underlying member method code with example usage: obj.SerializePartialToString() without return types