<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def serialize(self, tag):
 """Serialize tag and print it to the output."""

        try:
            tag.serialize(self)
        except (AttributeError, TypeError):
            self.write(str(tag))