Issue 14898: Dict collision on boolean and integer values (original) (raw)

Issue14898

Created on 2012-05-24 10:38 by sbermeister, last changed 2022-04-11 14:57 by admin. This issue is now closed.

Messages (3)
msg161497 - (view)	Author: Sasha B (sbermeister)	Date: 2012-05-24 10:38
Not sure if this is predicted behaviour, but if I make a dict like: >>> x = {0: 'bar', True: 'foo'} and modify True with 1, or 0 with False: >>> x[False] = 'boo' >>> x[1] = 'far' the modifications happen: >>> x {0: 'boo', True: 'far'} Is this expected behaviour? It seems that the hashes for 'False' and 0 are confused, as are the hashes for 'True' and 1.
msg161498 - (view)	Author: Mark Dickinson (mark.dickinson) *	Date: 2012-05-24 10:41
Thanks for the report. Yes, this is expected. Dictionary membership is based on equality of keys. Since True and 1 are equal, only one of them can be present in a dictionary at a time (and a key lookup works with either). >>> x = {0: 'bar'} >>> x[0] 'bar' >>> x[False] 'bar' >>> x[0.0] 'bar' >>> 0 == False True
msg161499 - (view)	Author: Sasha B (sbermeister)	Date: 2012-05-24 10:48
Ahh, I see. You are correct. Thanks.