STINNER Victor <vstin...@redhat.com> added the comment:

Steve:
> Imagine you're an existing application and you want to embed Python. Why 
> would you ever want it to suddenly change your global settings like this?

I have a very good news for you :-) Slowly but steadily, we converge on a 
agreement ;-)

The more time I spend on PEP 587, the more I think that the following use cases 
are too different and "incompatible":

* customized Python interpreter: behaves as the "regular Python"
* Embedded Python

I drafted "Isolate Python" in my PEP 587. With subtle options like 
configure_c_stdio, parse_argv and now configure_locale, it seems like we really 
need two *separated* these two configurations.

I implemented exactly that in PR 13388, I added 2 functions:

* _PyCoreConfig_InitPythonConfig(): provide a default configuration which 
parses command line arguments, enable UTF-8 Mode depending on the locale, read 
global configuration variables, read environment variables, etc.

* _PyCoreConfig_InitIsolateConfig(): isolated from the system, ignore command 
line arguments, ignore global configuration variables, leave the LC_CTYPE 
locale and C streams unchanged, etc.

I'm working on an update of my PEP to better describe that.

--

So I understand that this option is needed and you should prefer to turn it off 
by default in _PyCoreConfig_InitIsolateConfig.

----------

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<https://bugs.python.org/issue36945>
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