<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def on_ifexp(self, node):
 # ('test', 'body', 'orelse') """If expressions."""

        expr = node.orelse
        if self.run(node.test):
            expr = node.body
        return self.run(expr)