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Ctrl+C corrupts autocomplete #134869

Description

@danielzgtg

Bug report

Bug description:

  1. Open the REPL
  2. Type dict.c
  3. Press tab twice
  4. Press Ctrl + C

Expected behavior

There should be nothing after KeyboardInterrupt, and nothing after >>> like Node.js and PowerShell.

$ ./python
Python 3.15.0a0 (heads/main: future expected behavior ) [GCC 14.2.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> dict.c
KeyboardInterrupt
>>> 

Actual behavior

The autocomplete was not cleared, and what is a KeyboardInterrupt.copy(?

$ ./python
Python 3.15.0a0 (heads/main:e9d845b41dc, May 28 2025, 18:37:23) [GCC 14.2.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> dict.c
KeyboardInterrupt.copy(                                                                                                                                                               
>>> 
dict.clear(  dict.copy(

CPython versions tested on:

CPython main branch

Operating systems tested on:

Linux

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    stdlibStandard Library Python modules in the Lib/ directorytopic-replRelated to the interactive shelltype-bugAn unexpected behavior, bug, or error

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