CTRL+C/KeyboardInterrupt in editline not working properly on macOS REPL

[milosivanovic]

Bug report

With the following in ~/.editrc:

bind "^R" em-inc-search-prev

Pressing CTRL+R inside the macOS-bundled python (/usr/bin/python3, which is compiled against editline) to enter editline history, and then pressing CTRL+C does not properly remove "bck" and does not write KeyboardInterrupt until CTRL+C is pressed two more times for a total of three times.

In other words, inside an editline history search, CTRL+C needs to be sent three times to get back to the normal REPL state.

This video may help with understanding the issue: Homebrew/homebrew-core#118869 (comment)

Your environment

• CPython versions tested on: 3.9.6
• Operating system and architecture: macOS Monterey 12.6.1 / M1 / arm64

[ned-deily]

To be clear, /usr/bin/python3 is the python supplied by Apple as part of Xcode or the Command Line Tools and not Homebrew or python.org macOS installers.

[milosivanovic]

Since python.org's DMG is also built against editline, it's expected to have the same issue. I just installed it and confirmed the same problem exists there (see the video for a better understanding):

milos@air:~$ which python3
/Library/Frameworks/Python.framework/Versions/3.11/bin/python3
milos@air:~$ python3
Python 3.11.1 (v3.11.1:a7a450f84a, Dec  6 2022, 15:24:06) [Clang 13.0.0 (clang-1300.0.29.30)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> ^CenSSL
bck:O
^C
KeyboardInterrupt
>>>