Iteratoration question

grocery_stocker cdalten at gmail.com
Fri Apr 3 00:14:49 CEST 2009


Give the following code..

>>> class it:
...    def __init__(self):
...        self.count = -1
...    def next(self):
...        self.count +=1
...        if self.count < 4:
...            return self.count
...        else:
...            raise StopIteration
...
>>> def some_func():
...     return it()
...
>>> iterator = some_func()
>>> iterator
<__main__.it instance at 0xb7f482ac>
>>> some_func
<function some_func at 0xb7f45e64>
>>> some_func()
<__main__.it instance at 0xb7f4862c>

How come when I call some_func().next(), the counter doesn't get
incremented?
>>> some_func().next()
0
>>> some_func().next()
0
>>> some_func().next()
0

But when I call iterator.next(), it does.
>>> iterator.next()
0
>>> iterator.next()
1
>>> iterator.next()
2
>>> iterator.next()
3
>>>



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