code: def __init__(self, _msg, _subtype="rfc822"):
      """Create a message/* type MIME document.
  
      _msg is a message object and must be an instance of Message, or a
      derived class of Message, otherwise a TypeError is raised.
  
      Optional _subtype defines the subtype of the contained message.  The
      default is "rfc822" (this is defined by the MIME standard, even though
      the term "rfc822" is technically outdated by RFC 2822).
      """
      MIMENonMultipart.__init__(self, "message", _subtype)
      if not isinstance(_msg, message.Message):
          raise TypeError("Argument is not an instance of Message")
      # It's convenient to use this base class method.  We need to do it
      # this way or we'll get an exception
      message.Message.attach(self, _msg)
      # And be sure our default type is set correctly
      self.set_default_type("message/rfc822")
  
imports: from email import message
  from email.mime.nonmultipart import MIMENonMultipart
label_desc: Use image node_id 1 to create a new MIMEMessage object from inherited base classes: MIMENonMultipart with example: obj = MIMEMessage(_msg, _subtype)