Colorized output implemented in new REPL leaks into old REPL

[eugenetriguba]

Bug report

Bug description:

When I run PYTHON_BASIC_REPL=1 ./python.exe from the main branch, the exception output is colorized:

However, this isn't the case using the old REPL on older Python versions:

Whether this is a "bug" can be decided on, but it is different behavior that seemed like it was unintentional to me so I wanted to log it here.

CPython versions tested on:

CPython main branch

Operating systems tested on:

macOS

[AlexWaygood]

I don't think this is actually anything to do with the REPL per se. I think this is just a consequence of the fact that all tracebacks -- in the REPL or otherwise -- are colourised on Python 3.13+, in a separate feature that has been added

[eugenetriguba]

@AlexWaygood Ah I appreciate the additional context there. I wasn't aware of that, thanks! Is this a "close, no issue here" then?

[AlexWaygood]

I think so, yup! See #112730 for more context :-)