Redundant quotes in `subprocess.TimeoutExpired` message

Bug report

Bug description:

Bug description:

While looking into https://github.com/python/cpython/pull/151486, I noticed a similar issue in subprocess.TimeoutExpired.__str__.

subprocess.TimeoutExpired.__str__ manually wraps cmd in single quotes while formatting the exception message.
This produces confusing output when cmd is a list, because the list representation already contains quotes around its string elements.

import subprocess
import sys

cmd = [sys.executable, "-c", "import time; time.sleep(10)"]
subprocess.run(cmd, timeout=0.01)

Current output:

Traceback (most recent call last):
  ...
subprocess.TimeoutExpired: Command '['...python...', '-c', 'import time; time.sleep(10)']' timed out after 0.01 seconds

Expected output:

Traceback (most recent call last):
  ...
subprocess.TimeoutExpired: Command ['...python...', '-c', 'import time; time.sleep(10)'] timed out after 0.01 seconds

CPython versions tested on:

CPython main branch

Operating systems tested on:

Linux

Linked PRs

• gh-152559

Commencez par subprocess.TimeoutExpired.str et examinez les tests d’exception subprocess existants. Reproduisez l’exemple de timeout, ajustez le message attendu afin que la représentation de la commande ne soit pas entourée de manière redondante, et vérifiez que les tests subprocess concernés passent ; le PR lié gh-152559 indique que le travail est déjà en cours.