[ python-Bugs-1317376 ] irregular behavior within class using __setitem__

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Bugs item #1317376, was opened at 2005-10-08 02:27
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Category: Python Interpreter Core
Group: Python 2.3
Status: Open
Resolution: None
Priority: 5
Submitted By: capnSTABN (capnstabn)
Assigned to: Nobody/Anonymous (nobody)
Summary: irregular behavior within class using __setitem__

Initial Comment:
i found two bugs vaguely similar to this posted but i 
think they were different bugs in theory, and both were 
deemed 'features' anyway so ... :p

basically the class is a modified list, being used as a 
queue

what happens is, when hotswapping the __setitem__ 
functionality, unless explicitly calling __setitem__, the 
old __setitem__ continues to be called

this is very odd and as far as i can tell the behavior is 
undocumented


class Queue(list):
def __setitem__(self, a, v):
print "old setitem"
def mysetitem(self, i, v):
print "new setitem"
def use_mysetitem(self):
self.__setitem__ = self.mysetitem

x = Queue()

x[1] = 2

x.__setitem__(2, 3)

x.use_mysetitem()
x[3] = 4

x.__setitem__(4, 5)


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https://sourceforge.net/tracker/?func=detail&atid=105470&aid=1317376&group_id=5470