[issue33879] Item assignment in tuple mutates list despite throwing error

[R. David Murray]

Change by R. David Murray :


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resolution:  -> not a bug
stage:  -> resolved
status: open -> closed

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[issue33879] Item assignment in tuple mutates list despite throwing error

[Karthikeyan Singaravelan]

Karthikeyan Singaravelan  added the comment:

Interesting. I googled this and came across this note which covers this : 
https://docs.python.org/2/faq/programming.html#why-does-a-tuple-i-item-raise-an-exception-when-the-addition-works

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nosy: +xtreak

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[issue33879] Item assignment in tuple mutates list despite throwing error

[njayinthehouse]

New submission from njayinthehouse :

Seems like a bug.

>>> a = (1, [1])
>>> a[1] += [2]
Traceback (most recent call last):
  File "", line 1, in 
TypeError: 'tuple' object does not support item assignment
>>> a
(1, [1, 2])

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messages: 319748
nosy: njayinthehouse
priority: normal
severity: normal
status: open
title: Item assignment in tuple mutates list despite throwing error
type: behavior
versions: Python 2.7, Python 3.4, Python 3.5

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