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To: python-list@python.org
From: Terry Reedy <tjreedy@udel.edu>
Subject: Re: IDLE being too clever checking nonlocal declarations?
Date: Mon, 21 Oct 2013 15:51:56 -0400
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On 10/21/2013 11:06 AM, Chris Angelico wrote:
> Try typing this into IDLE:
>
>>>> def a():
>      def b():
>          nonlocal q
> SyntaxError: no binding for nonlocal 'q' found

If you submit those three lines to Python from the command line, that is 
what you see.

> In interactive command-line Python, this doesn't throw an error,
> it works fine if the name is used later:
>
>>>> def a():
>      def b():
>          nonlocal q
>          q+=1

I verified that interactive Python also syntax checks each line as 
entered, even for compound statements. Details should be left to the 
tracker issue you raised.

-- 
Terry Jan Reedy