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From: Terry Jan Reedy <tjreedy@udel.edu>
Subject: Re: Short-circuit Logic
Date: Sun, 26 May 2013 16:19:17 -0400
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Xref: csiph.com comp.lang.python:46111

On 5/26/2013 7:11 AM, Ahmed Abdulshafy wrote:

>       if not allow_zero and abs(x) < sys.float_info.epsilon:
>                  print("zero is not allowed")

The reason for the order is to do the easy calculation first and the 
harder one only if the first passes.