New submission from andrew <atc...@gmail.com>:
After debugging for a while I finally released that I stumbled across a Python
bug (at least I believe it is). Here is a proof of concept that produces the
issue:
!/usr/bin/python
class blah:
def __init__(self, items=[]):
self.items = items
a = blah()
b = blah()
a.items.append("apples")
b.items.append("oranges")
print a.items
print b.items
print id(a.items)
print id(b.items)
and here is the output when the program is run:
r...@x:~# python pythonbug.py
['apples', 'oranges']
['apples', 'oranges']
135923500
135923500
r...@x:~#
as you can see the 'items' reference is the same for both objects even though
they are different objects. I checked the manual and I couldn't find anything
explaining such behavior. Can this possibly be correct?
My python info:
Python 2.5.2 (r252:60911, Jan 20 2010, 21:48:48)
----------
messages: 106018
nosy: bolt
priority: normal
severity: normal
status: open
title: default value in constructor not unique across objects
type: behavior
versions: Python 2.5
_______________________________________
Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue8762>
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