Dick Moores wrote:
> At 03:25 AM 10/3/2006, Andre Roberge wrote:
>> On 10/3/06, Dick Moores <[EMAIL PROTECTED]> wrote:
>>> Is there Python code for accessing an object's reference count?
>> See sys.getrefcount.
>
> Fascinating. And surprising.
> >>> from sys import getrefcount
> >>> getrefcount(1)
> 493
> >>> getrefcount(2)
> 157
> >>> getrefcount(3)
> 60
> >>> getrefcount(22)
> 12
> >>> getrefcount(222)
> 3
> >>> getrefcount(222234523452345345)
> 2
> >>> getrefcount(2.23452345345)
> 2
> >>>
>
> That refcount for 1 (and 2, 3, and 12) is puzzling to me. I closed
> python, called python, and tried it again. Essentially no change.
> When would this go to zero? Only when I shut off my computer?
When you exit Python.
There are quite a few modules loaded automatically when Python starts
up. It's not too surprising that a few of them reference 1. For example,
defining a function that uses a constant creates a reference to the
constant:
In [2]: sys.getrefcount(100)
Out[2]: 43
In [3]: def foo():
...: return 100
...:
In [4]: sys.getrefcount(100)
Out[4]: 44
Kent
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