[issue40264] List item inside tuple seemingly allows for item assignment even after throwing error

Eric V. Smith added the comment: This isn't a bug. See the FAQ: https://docs.python.org/3/faq/programming.html#why-does-a-tuple-i-item-raise-an-exception-when-the-addition-works -- nosy: +eric.smith resolution: -> not a bug stage: -> resolved status: open -> closed

[issue40264] List item inside tuple seemingly allows for item assignment even after throwing error

Change by Raymond Hettinger : -- nosy: +rhettinger ___ Python tracker ___ ___ Python-bugs-list mailing list Unsubscribe:

[issue40264] List item inside tuple seemingly allows for item assignment even after throwing error

New submission from Rahul B : Even though item assignment throws error, the list inside tuple 'a' gets modified in place. Refer below, where the list value [8] gets added to the list value [5,6,7,7] at a[3] >>> a (2, 3, 4, [5, 6, 7, 7], 1) >>> id(a[3]) 140531212178376 >>> a[3]+=[8] Traceback