How to know that two pyc files contain the same code

Bl0ckeduser bl0ckedusersoft at gmail.com
Sat Mar 10 16:08:18 CET 2012


Gelonida N wrote:
> Hi,
>
> I want to know whether two .pyc files are identical.
>
> With identical I mean whether they contain the same byte code.
>
> Unfortunately it seems, that .pyc files contain also something like the
> time stamp of the related source file.
>
> So though two pyc files contain the same byte code, they will not be
> byte identical.
>
> One option, that I found is to use
> python -m unpyclib.application -d filename.pyc and check whether the
> results are identical.
>
>
> However even this will fail if the files were not compiled under the
> same absolute path name as the source filename is contained twice  (at
> least for my trivial example) in the disassemblers output.
>
>
> Thanks a lot for any other idea.
>

Try using the disassembler code here:

http://nedbatchelder.com/blog/200804/the_structure_of_pyc_files.html

and removing from it the parts which print out the timestamp and the 
absolute path. (Two different lines in the source). That seems to work 
for me.






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