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From: Terry Reedy <tjreedy@udel.edu>
Subject: Re: Disable use of pyc file with no matching py file
Date: Mon, 30 Jan 2012 17:43:41 -0500
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Xref: x330-a1.tempe.blueboxinc.net comp.lang.python:19615

On 1/30/2012 4:30 PM, Roy Smith wrote:
> Every so often (typically when refactoring), I'll remove a .py file
> and forget to remove the corresponding .pyc file.  If I then import
> the module, python finds the orphaned .pyc and happily imports it.
> Usually leading to confusing and hard to debug failures.
>
> Is there some way to globally tell python, "Never import a .pyc
> unless the corresponding .py file exits"?

Upgrade to 3.2.

-- 
Terry Jan Reedy