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

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On 01/30/2012 09:30 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"?  Perhaps some environment variable I could set in my .login file?

If you want to stay python only I have this function:

def clean_orphaned_pycs(directory, simulate=False):
     """Remove all .pyc files without a correspondent module
     and return the list of the removed files.
     If simulate=True don't remove anything but still return
     the list of pycs
     """

     exists, join = path.exists, path.join
     rm = (lambda _: None) if simulate else remove
     removed = []

     for root, dirs, files in walk(directory):
         for f in files:
             if f.endswith(".pyc"):
                 pyc = join(root, f)
                 if not exists(pyc[:-1]):
                     logger.debug("DELETING orphaned file %s" % pyc)
                     removed.append(pyc)
                     rm(pyc)

         # ignore certain sub-dirs
         for i in reversed(range(len(dirs))):
             d = dirs[i]
             if d == ".svn" or d.endswith(".egg-info"):
                 dirs.pop(i)  # dirs.remove(d)

     return removed

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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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