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Showing content from https://mail.python.org/pipermail/python-dev/2017-November/150563.html below:

[Python-Dev] Add a developer mode to Python: -X dev command line option

[Python-Dev] Add a developer mode to Python: -X dev command line optionVictor Stinner victor.stinner at gmail.com
Wed Nov 15 21:57:49 EST 2017
Hi,

Since Brett and Nick like the idea and nobody complained against it, I
implemented the -X dev option:
https://bugs.python.org/issue32043
(Right now, it's a pull request.)

I removed the -b option.

Victor

2017-11-14 3:57 GMT+01:00 Nick Coghlan <ncoghlan at gmail.com>:
> On 14 November 2017 at 02:08, Victor Stinner <victor.stinner at gmail.com> wrote:
>> My "-X dev" idea is not incompatible with Nick's PEP 565 "Show
>> DeprecationWarning in __main__" and it's different: it's an opt-in
>> option, while Nick wants to change the default behaviour.
>
> I'm +1 on a `-X dev` mode, since it enables a lot of things that are
> useful for making an application more robust (extension module
> debugging, explicit scope-controlled resource management) that I
> wouldn't want turned at the REPL by default. It also implicitly
> adjusts over time as we add more debugging capabilities.
>
> I don't consider it a replacement for tweaking how we handle
> DeprecationWarning by default, though :)
>
> Cheers,
> Nick.
>
> --
> Nick Coghlan   |   ncoghlan at gmail.com   |   Brisbane, Australia
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