Groups > comp.lang.python > #19663

Re: Disable use of pyc file with no matching py file

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From	Terry Reedy <tjreedy@udel.edu>
Subject	Re: Disable use of pyc file with no matching py file
Date	Tue, 31 Jan 2012 18:43:32 -0500
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On 1/31/2012 3:20 PM, John Roth wrote:
> On Jan 30, 3:43 pm, Terry Reedy<tjre...@udel.edu>  wrote:
>> 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.

I tested before writing this. The caveat is that x.pyc in the same 
directly as x.py will not be ignored (for back compatibility). However, 
this only happens intentionally as .pyc files are put in __pycache__/ 
with name x.<version>.pyc, where <version> is 'cpython-32' or something 
similar for another version or implementation.

> I've noticed that the tutorial (section 6.1.3) hasn't been updated for
> PEP 3147; there's no way of telling that this is the behavior from
> reading the tutorial. The development doc for 3.3 hasn't been updated
> either.

You are right. An oversight. Thanks for noticing.
http://bugs.python.org/issue13915
Suggested rewrites are welcome.

-- 
Terry Jan Reedy

Thread

Disable use of pyc file with no matching py file Roy Smith <roy@panix.com> - 2012-01-30 13:30 -0800
  Re: Disable use of pyc file with no matching py file Miki Tebeka <miki.tebeka@gmail.com> - 2012-01-30 14:13 -0800
  Re: Disable use of pyc file with no matching py file Terry Reedy <tjreedy@udel.edu> - 2012-01-30 17:43 -0500
    Re: Disable use of pyc file with no matching py file John Roth <johnroth1@gmail.com> - 2012-01-31 12:20 -0800
      Re: Disable use of pyc file with no matching py file Terry Reedy <tjreedy@udel.edu> - 2012-01-31 18:43 -0500
        Re: Disable use of pyc file with no matching py file John Roth <johnroth1@gmail.com> - 2012-02-01 05:11 -0800
          Re: Disable use of pyc file with no matching py file Terry Reedy <tjreedy@udel.edu> - 2012-02-01 14:57 -0500
  Re: Disable use of pyc file with no matching py file Jean-Michel Pichavant <jeanmichel@sequans.com> - 2012-01-31 11:26 +0100
    Re: Disable use of pyc file with no matching py file Ben Finney <ben+python@benfinney.id.au> - 2012-01-31 22:56 +1100
    Re: Disable use of pyc file with no matching py file Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2012-01-31 12:01 +0000
      Re: Disable use of pyc file with no matching py file Jean-Michel Pichavant <jeanmichel@sequans.com> - 2012-01-31 15:19 +0100
      Re: Disable use of pyc file with no matching py file Terry Reedy <tjreedy@udel.edu> - 2012-01-31 18:55 -0500
        Re: Disable use of pyc file with no matching py file Roy Smith <roy@panix.com> - 2012-01-31 23:14 -0500
          Re: Disable use of pyc file with no matching py file Terry Reedy <tjreedy@udel.edu> - 2012-02-01 05:28 -0500
      Re: Disable use of pyc file with no matching py file Jean-Michel Pichavant <jeanmichel@sequans.com> - 2012-02-01 11:12 +0100
      Re: Disable use of pyc file with no matching py file Devin Jeanpierre <jeanpierreda@gmail.com> - 2012-02-01 06:14 -0500
      Re: Disable use of pyc file with no matching py file Terry Reedy <tjreedy@udel.edu> - 2012-02-01 14:53 -0500
      Re: Disable use of pyc file with no matching py file Devin Jeanpierre <jeanpierreda@gmail.com> - 2012-02-02 01:42 -0500
      Re: Disable use of pyc file with no matching py file Terry Reedy <tjreedy@udel.edu> - 2012-02-02 04:21 -0500
        Re: Disable use of pyc file with no matching py file Brian <not_here@no-where.net> - 2012-02-12 10:53 -0800
  Re: Disable use of pyc file with no matching py file Andrea Crotti <andrea.crotti.0@gmail.com> - 2012-01-31 11:18 +0000

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