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From: Terry Reedy <tjreedy@udel.edu>
Subject: Re: enhancement request: make py3 read/write py2 pickle format
Date: Wed, 10 Jun 2015 19:25:33 -0400
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Xref: csiph.com comp.lang.python:92430

On 6/10/2015 6:10 PM, Devin Jeanpierre wrote:

> The problem is that there are two different ways repr might write out
> a dict equal to {'a': 1, 'b': 2}. This can make tests brittle

Not if one compares objects rather than string representations of 
objects.  I am strongly of the view that code and tests should be 
written to directly compare objects as much as possible.

> it's why doctest fails badly at examples involving dictionaries.

or sets or addresses or object ids or locale-dependent strings or random 
numbers or values dependent on random numbers.

-- 
Terry Jan Reedy