Consider

foo = ["a", "b"]
for i in ["c"]:
    foo.remove(i)

This throws with a useless error message:

Traceback (most recent call last):
  File "/Users/tdegeus/Downloads/t.py", line 3, in <module>
    foo.remove(i)
ValueError: list.remove(x): x not in list

Instead it would be very helpful to show the value of x. Now one needs extra manual debugging, or extra lines of code.

Linked PRs

• gh-96844: Improve error message of list.remove #106455
• Revert "gh-96844: Improve error message of list.remove (gh-106455)" #116956