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From: Terry Reedy <tjreedy@udel.edu>
Subject: Re: Return and set
Date: Tue, 19 Jul 2011 15:18:34 -0400
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Xref: x330-a1.tempe.blueboxinc.net comp.lang.python:9917

On 7/19/2011 1:00 PM, Micah wrote:
> That sounds artificially backwards; why not let getToken() reuse peekToken()?
>
> def peek(self):
>      if self.tok is None:
>          try:
>              self.tok = self.gen.next()

If this is changed (as intended for the iteration protocol) to

              self.tok = next(self.gen)

then this code (and OP's version) should run as is on both Py2.6/7 and Py3.

>          except StopIteration:
>              self.tok = NULL
>      return self.tok
>
> def pop(self):
>      token = self.peek()
>      self.tok = None
>      return token


-- 
Terry Jan Reedy