Current (selected) message.
def get_message_number() -> int: ... def set_message_number(value: int) -> None: ...
message_number = property(get_message_number, set_message_number)
This property indicates the current/selected message. This property specifies a message number in between 1 and message_count. The various class methods related to single messages use this property as a message pointer (see method descriptions and the message_size property).