[Python-Dev] #12982: Should -O be required to read .pyo files? (original) (raw)

R. David Murray rdmurray at bitdance.com
Thu Jun 14 04:47:45 CEST 2012

On Thu, 14 Jun 2012 11:48:08 +1000, Nick Coghlan <ncoghlan at gmail.com> wrote:

On Thu, Jun 14, 2012 at 6:06 AM, Terry Reedy <tjreedy at udel.edu> wrote: > On 6/13/2012 2:46 PM, Antoine Pitrou wrote: > >> Not only docstrings, but also asserts. I think running a pyo without -O >> would be a bug. > > That cat is already out of the bag ;-) > People are doing that now by renaming x.pyo to x.pyc. > Brett claims that it is also easy to do in 3.3 with a custom importer.

Right, but by resorting to either of those approaches, people are clearly doing something that isn't formally supported by the core. Yes, you can do it, and most of the time it will work out OK, but any weird glitches that result are officially not our problem. The main reason this matters is that the "debug" flag is supposed to be process global - if you check it in one place, the

OK, the above are the two concrete reasons I have heard in this thread for continuing the current behavior:

1) we do not wish to support running from .pyo files without -O
   being on, even if it currently happens to work

2) the __debug__ setting is supposed to be process-global

Both of these are good reasons. IMO the issue should be closed with a documentation fix, which could optionally include either or both of the above motivations.

--David

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