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This issue has been migrated to GitHub: https://github.com/python/cpython/issues/68534

classification

Title:	TypeError at List in Tuple concatenation
Type:	behavior	Stage:	resolved
Components:	Interpreter Core	Versions:	Python 3.4

process

Status:	closed	Resolution:	not a bug
Dependencies:		Superseder:
Assigned To:		Nosy List:	r.david.murray, stf
Priority:	normal	Keywords:

Created on 2015-06-01 14:48 by stf, last changed 2022-04-11 14:58 by admin. This issue is now closed.

Messages (2)
msg244588 - (view)	Author: (stf)	Date: 2015-06-01 15:01
>>> a = ([1,2],) >>> a[0] += [3] this raises an Type Error but adds the Elements to a. So a is ([1, 2, 3],) afterwards. This Problem doesn't occur, when you use a[0].append(3)
msg244590 - (view)	Author: R. David Murray (r.david.murray) *	Date: 2015-06-01 15:12
https://docs.python.org/3/faq/programming.html#why-does-a-tuple-i-item-raise-an-exception-when-the-addition-works