Cannot interrupt process in inferior python if the process is started from an Elpy buffer

[novusshu]

Summary

This issue is driving me crazy. Simply put, if I start the interactive python with run-python, I can use C-c C-c which binds to comint-interrupt-subjob to interrupt current job (e.g., an infinite loop), and the process is still alive. However, I simply cannot use C-c C-c in an inferior python started from elpy mode python script (e.g., with C-return, or C-c C-z, etc. ). Basically I cannot find a way to interrupt the process without kill the buffer.

I compared an inferior buffer started with run-python and with say, C-return, only to find that they have the exactly same minor modes and major mode (using C-h m). I did realize that Elpy has a slightly different way to start the inferior python based on the documentation for elpy-shell-get-or-create-process, in which it states that

;; We cannot use run-python directly, as it selects the new shell ;; buffer. See https://github.com/jorgenschaefer/elpy/issues/1848

Yet, by comparing the code, I still cannot figure out why C-c C-c works in one way but not another. Someone help!!!

Steps to reproduce

1. Open any .py file, write a simple infinite loop, e.g.,

   while(1):
   print(1)

   make sure your Elpy mode is enabled for the python buffer

2. Press Ctrl-: an inferior buffer should start.
3. Switch to the inferior python buffer, press C-c C-c, and you will find yourself not able to interrupt the infinite loop.

Now, if you change Step 2 to 2: 2. M-x run-python, Then in step 3, C-c C-c will do the job to terminate the loop.

My configuration

OS

MacOS 12.2.1

Result of (elpy-config)

Emacs.............: 28.0.91
Elpy..............: 1.35.0
Virtualenv........: None
Interactive Python: python3 3.9.10 (/opt/homebrew/bin/python3)
RPC virtualenv....: rpc-venv (/Users/XXXX/.emacs.d/elpy/rpc-venv)
 Python...........: python3 3.8.9 (/Users/XXXX/.emacs.d/elpy/rpc-venv/bin/python3)
 Jedi.............: 0.18.1
 Autopep8.........: 1.6.0
 Yapf.............: 0.32.0
 Black............: 22.1.0
Syntax checker....: flake8 (/opt/homebrew/bin/flake8)

Elpy configuration in my init.el

I don't think Elpy configuration matters, because I can reproduce the same problem with no Elpy setup.

  (setq python-shell-interpreter "python3"
    python-shell-interpreter-args "-i"
    python-shell-prompt-detect-failure-warning nil)
  (add-to-list 'python-shell-completion-native-disabled-interpreters
           "python")

    (use-package elpy
      :ensure t
      :defer t
      :init
      (advice-add 'python-mode :before 'elpy-enable)
      :config
      (setq 
       elpy-rpc-virtualenv-path 'default
       elpy-rpc-python-command "python3" 
       ;; elpy-shell-starting-directory 'current-directory
       )
      ;; enable code folding
      (add-hook 'elpy-mode-hook 
'hs-minor-mode)
      ;; use flycheck instead of flymake
      (when (load "flycheck" t t)
    (setq elpy-modules (delq 'elpy-module-flymake elpy-modules))
    (add-hook 'elpy-mode-hook 'flycheck-mode))
      (setq flycheck-python-pycompile-executable "python3")

      ;; ensure auto-complete is disabled for python
      (with-eval-after-load 'auto-complete
    (setq ac-modes (delq 'python-mode ac-modes)))
      )