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To: python-list@python.org
From: Dave Angel <davea@davea.name>
Subject: Re:Testing interactive code using raw_input
Date: Mon, 10 Mar 2014 12:40:19 -0400 (EDT)
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Xref: csiph.com comp.lang.python:68160

 Steven D'Aprano <steve+comp.lang.python@pearwood.info> Wrote in
 message:
> Does anyone have any good hints for testing interactive code that uses 
> raw_input, or input in Python 3?
> 
> A simple technique would be to factor out the interactive part, e.g. like 
> this:
> 
> # Before
> def spam():
>     answer = raw_input(prompt)
>     return eggs(answer) + cheese(answer) + toast(answer)
> 
> # After
> def spam():
>     answer = raw_input(prompt)
>     return func(answer)
> 
> def func(s):
>     return eggs(s) + cheese(s) + toast(s)
> 
> 
> 
> and then test func. But how about times where it is inconvenient to 
> factor out the raw_input stuff out of the function? E.g. suppose you have 
> a function that takes some arguments, gathers some more values 
> interactively, processes the lot, and then returns a result. With an 
> automated test, I can provide the arguments, and check the result, but 
> what are my options for *automatically* supplying input to raw_input?
> 

How about reassigning sys.stdin to a StringIO buffer?

-- 
DaveA