Race condition when generating .pyc files

Aaron "Castironpi" Brady castironpi at gmail.com
Tue Oct 7 18:43:06 CEST 2008

On Oct 7, 10:21 am, "yogamatt1... at gmail.com" <yogamatt1... at gmail.com>
> I have a large body of Python code which runs on many different (Unix)
> machines concurrently.  Part of the code lives in one place, but most
> of it lives in directories which I find at runtime.  I only have one
> copy of each Python source file and I think I'm hitting a race
> condition where two hosts attempt to import the same module at the
> same time.  My import fails on one of the machines and the following
> exception is thrown:
> EOFError: EOF read where object expected
> My hypothesis is that there's contention between the two (or more)
> hosts when the module's .pyc file is generated.

Acquire an flock on the .py file, then compile it.

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