def __init__(self, message=None):
self.spent = False
self.envelope = Envelope(message)
super(MessageProducer, self).__init__()
def __init__(self):
self.envelope = Envelope()
self.terminator = self.envelope.delimiter() * 2
# Note that order is reversed so pop() gets first.
self.writers = [self.write_body, self.write_head]
super(MessageBuilder, self).__init__()
