[Python-ideas] Add a cryptographic hash (e.g SHA1) of source toPython Compiled objects?
brett at python.org
Wed Feb 4 19:36:26 CET 2009
On Wed, Feb 4, 2009 at 01:57, <rocky at gnu.org> wrote:
> Terry Reedy writes:
> > rocky at gnu.org wrote:
> > > Without a doubt you all are much more familiar at this stuff that I
> > > am. (In fact I'm a rank novice.) So I'd be grateful if someone would
> > > post code for a function say:
> > >
> > > compare_src_obj(python_src, python_obj)
> > >
> > > that takes two strings -- a Python source filename and a Python object
> > > -- does what's outlined above, and returns a status which indicates
> > > the same or if not and if not whether the difference is because of the
> > > wrong version of Python was used.
> > Interesting question. For equaility, I would start with, just guessing
> > a bit:
> > marshal(compile(open(file.py).read())) == open(file.pyc).read()
> > Specifically for version clash, I believe the first 4 bytes are a magic
> > version number. If that is not part of the marshal string, it would
> > need to be skipped for the equality comparison.
> There's also the mtime that needs to be ignored mentioned in prior
> posts. And is there a table which converts a magic number version back
> into a string with the Python version number? Thanks.
marshal.dumps(compile(open('file.py').read(), 'file.py', 'exec')) ==
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