On Tue, Feb 16, 2016 at 9:00 PM Mike Kaplinskiy <mike.kaplins...@gmail.com> wrote:
> Hey folks, > > I hope this is the right list for this sort of thing (python-ideas seemed > more far-fetched). > > For some context: there is currently a issue with pex that causes > sys.modules lookups to stop working for __main__. In turns this makes > unittest.run() & pkg_resources.resource_* fail. The root cause is that pex > uses runpy.run_module with alter_sys=False. The fix should be to just pass > alter_sys=True, but that changes sys.argv[0] and various existing pex files > depend on that being the pex file. You can read more at > https://github.com/pantsbuild/pex/pull/211 . > > Conservatively, I'd like to propose adding an argument to disable this > behavior. The current behavior breaks a somewhat reasonable invariant that > you can restart your program via `os.execv([sys.executable] + sys.argv)`. > I don't know enough about pex to really dig into what it is trying to do so this is tangential to answering your question but: sys.executable may be None. ex: If you're an embedded Python interpreter there is no Python executable. It cannot be blindly used re-execute the current process. sys.argv represents the C main() argv array. Your inclination (in the linked to bug above) to leave sys.argv[0] alone is a good one. -gps Moreover it might be user-friendly to add a `argv=sys.argv[1:]` argument to > set & restore the full arguments to the module, where `argv=None` disables > argv[0] switching. > > What do you think? > > Mike. > > _______________________________________________ > Python-Dev mailing list > Python-Dev@python.org > https://mail.python.org/mailman/listinfo/python-dev > Unsubscribe: > https://mail.python.org/mailman/options/python-dev/greg%40krypto.org >
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