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Magic class member variable initialization with lists #45784
Description
| BPO | 1443 |
|---|---|
| Nosy | @gvanrossum |
| Files |
Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.
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GitHub fields:
assignee = None
closed_at = <Date 2007-11-14.19:19:50.559>
created_at = <Date 2007-11-14.19:10:35.370>
labels = ['interpreter-core', 'type-bug', 'invalid']
title = 'Magic class member variable initialization with lists'
updated_at = <Date 2007-11-14.19:19:50.530>
user = 'https://bugs.python.org/neoone'bugs.python.org fields:
activity = <Date 2007-11-14.19:19:50.530>
actor = 'gvanrossum'
assignee = 'none'
closed = True
closed_date = <Date 2007-11-14.19:19:50.559>
closer = 'gvanrossum'
components = ['Interpreter Core']
creation = <Date 2007-11-14.19:10:35.370>
creator = 'neoone'
dependencies = []
files = ['8745']
hgrepos = []
issue_num = 1443
keywords = []
message_count = 2.0
messages = ['57500', '57502']
nosy_count = 2.0
nosy_names = ['gvanrossum', 'neoone']
pr_nums = []
priority = 'normal'
resolution = 'not a bug'
stage = None
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue1443'
versions = ['Python 2.5']
Activity
neoone commentedon Nov 14, 2007
Initialization of member variables with lists leads to strange
behavior.
The list object is common to each instance of that class.
File attached results in:
[] [] <main.Proof instance at 0x00BA7120>
['STICKYARRAY'] [] <main.Proof instance at 0x00BA7148>
So the initialized list a is the same in both instances.
Behaviour has been tested on 2.3 and 2.5
gvanrossum commentedon Nov 14, 2007
Go ask on c.l.py why this is not a bug.