On Wed, Apr 14, 2021 at 5:00 AM Joachim Wuttke <j.wut...@fz-juelich.de> wrote:
> gzip compression, using class GzipFile from gzip.py, by default > inserts a timestamp to the compressed stream. If the optional > argument `mtime` is absent or None, then the current time is used [1]. > > This makes outputs non-deterministic, which can badly confuse > unsuspecting users: If you run "diff" over two outputs to see > whether they are unaffected by changes in your application, > then you would not expect that the *.gz binaries differ just > because they were created at different times. > > I'd propose to introduce a new constant `NO_TIMESTAMP` as > possible value of `mtime`. > > Furthermore, if policy about API changes allows, I'd suggest > that `NO_TIMESTAMP` become the new default value for `mtime`. > > How to proceed from here? Is this the kind of proposals that > has to go through a PEP? > For something like this you would open an issue and see if a core developer is intrigued enough to work with you to see the change occur; no PEP is necessary. -Brett > > - Joachim > > [1] > > https://github.com/python/cpython/blob/6f1e8ccffa5b1272a36a35405d3c4e4bbba0c082/Lib/gzip.py#L163 > > _______________________________________________ > Python-Dev mailing list -- python-dev@python.org > To unsubscribe send an email to python-dev-le...@python.org > https://mail.python.org/mailman3/lists/python-dev.python.org/ > Message archived at > https://mail.python.org/archives/list/python-dev@python.org/message/OTUGLATLYB736SAPPRWSSXWAKM5JHWZN/ > Code of Conduct: http://python.org/psf/codeofconduct/ >
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