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To: python-list@python.org
From: Terry Reedy <tjreedy@udel.edu>
Subject: Re: the logical operation confused me
Date: Thu, 10 Apr 2014 19:09:29 -0400
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On 4/10/2014 7:02 PM, length power wrote:
>  >>> "ok" or "not ok"
> 'ok'
>  >>> "ok" and "not ok"
> 'not ok'
>  >>>
>
> why "ok" or "not ok" output "ok"  , "ok" and "not ok"  output "not ok" ?

This is explained in our fine manual.
https://docs.python.org/2/reference/expressions.html#boolean-operations

-- 
Terry Jan Reedy