[issue14756] Empty Dict in Initializer is Shared Betwean Objects

[Matthew Walker]

New submission from Matthew Walker <mattofak at gmail.com>:

When initializing a class with an empty dict() object as a default initializer, if it is not overridden, multiple instances of the class will share the dictionary. IE:

class test(object):
  def __init__(self, obj=dict()):
    self.obj = obj

a = test()
b = test()

Then id(a.obj) points to the same location as id(b.obj). The behaviour I would expect would be that a.obj and b.obj would be unique instances.

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components: Interpreter Core
messages: 160212
nosy: Matthew.Walker
priority: normal
severity: normal
status: open
title: Empty Dict in Initializer is Shared Betwean Objects
versions: Python 2.7

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue14756>
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