In IronPython 2.0, when I replace a Point object in a list using assignment, a
copy of the Point object is used to replace the original list element rather
than the original Point itself. This does not happen with user-defined objects.
It also does not happen with Point objects in IronPython 1.1.
IronPython 2.0 (2.0.0.0) on .NET 2.0.50727.3053
Type "help", "copyright", "credits" or "license" for more information.
>>> import clr
>>> clr.AddReference("System.Drawing")
>>> from System.Drawing import *
>>>
>>> class C(object): pass
...
>>> def test1():
... p1 = C() # Create two objects
... p2 = C()
... l = [p1] # Put one in a list
... print id(l[-1]), id(p2) # Print ids of object in list (p1) and p2
... l[-1] = p2 # Replace p1 with p2 in list
... print id(l[-1]), id(p2) # Print ids of object in list and p2
...
>>> def test2():
... p1 = Point(1,2) # Create two Points
... p2 = Point(3,4)
... l = [p1] # Put one in a list
... print id(l[-1]), id(p2) # Print ids of Point in list (p1) and p2
... l[-1] = p2 # Replace p1 with p2 in list
... print id(l[-1]), id(p2) # Print ids of Point in list and p2
...
>>> test1()
43 44
44 44
>>> test2()
45 46
47 46 # The id of the Point before and after adding to the list is different
>>>
Here is the same program in IronPython 1.1
IronPython 1.1 (1.1) on .NET 2.0.50727.3053
Copyright (c) Microsoft Corporation. All rights reserved.
<snip>
>>> test1()
43 44
44 44
>>> test2()
45 46
46 46 # The id of the Point before and after adding to the list is the same
>>>
... or am I missing something.
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