<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def peek(self, steps=1):
 """Look ahead, doesn't affect current_token and next_token."""

        try:
            tokens = iter(self)
            for _ in six.moves.range(steps):
                next(tokens)

            return next(tokens)
        except StopIteration:
            return None