gh-127073: Clear completion list when KeyboardInterrupt occurs in REPL

[Natural-selection1]

Resolve #127073

New behavior:
The completion list is properly cleared on KeyboardInterrupt just consistent with the behavior of other errors

int.<TAB><TAB>

int.as_integer_ratio(  int.bit_length(        int.denominator        int.imag               int.mro()              int.real
int.bit_count(         int.conjugate(         int.from_bytes(        int.is_integer(        int.numerator          int.to_bytes(
>>> int.

<Ctrl+C>

>>> int.
KeyboardInterrupt
>>> 

• Issue: New Python REPL double-prints completion suggestions #127073

[bedevere-app]

Most changes to Python require a NEWS entry. Add one using the blurb_it web app or the blurb command-line tool.

If this change has little impact on Python users, wait for a maintainer to apply the skip news label instead.

[ZeroIntensity]

A test in test_repl would be nice :)

See the devguide for writing tests.

[ZeroIntensity]

Love the effort, but this is too long. Can we shorten this to a single sentence? (We don't need technical details, just what was fixed.)

[picnixz]

@Natural-selection1 Please, do not merge main into your branch if there is no conflict to solve or if nothing has changed since the last commit. In addition, please consider addressing comments by ZeroIntensity first.

[Natural-selection1]

@Natural-selection1 Please, do not merge main into your branch if there is no conflict to solve or if nothing has changed since the last commit. In addition, please consider addressing comments by ZeroIntensity first.

Sorry for any inconvenience caused. As a newcomer contributing to a large project like CPython, I sincerely regret the issues. Regarding the previously mentioned problems, I am actively working on resolving them. As for the test cases that need to be written, I am making efforts, though it may take some time to complete. I will treat this experience as a valuable learning opportunity.

[picnixz]

No worries. For now, I'll mark your PR as a draft. Once you've added the tests and rewritten the NEWS entry, just convert it back to a "ready-for-review" PR.

[python-cla-bot]

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