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From: Ian Kelly <ian.g.kelly@gmail.com>
Date: Thu, 24 Jul 2014 11:42:46 -0600
Subject: Re: How can I import unnecessary_math?
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On Thu, Jul 24, 2014 at 11:33 AM, fl <rxjwg98@gmail.com> wrote:
> Hi,
> I want to write some test code. Some on-line tutorials have such codes:
>
>
> from unnecessary_math import multiply
>
> When it runs, it has errors:
>
>>>> from unnecessary_math import multiply
> Traceback (most recent call last):
>   File "<interactive input>", line 1, in <module>
> ImportError: No module named unnecessary_math
>
> I have not found anywhere to download it. What explanation about the module:
>
> from unnecessary_math import multiply

A little bit of searching turns up this:

https://github.com/okken/markdown.py/blob/master/simple_example/unnecessary_math.py

It appears to be used as a simple example library for a doctesting demo.