[EMAIL PROTECTED] wrote:
> Can someone explain this?
>
>>>> a= {}
Create an empty dict and bind it to the name a.
>>>> a[(3,)]= 0
Set the key/value pair (3,):0 to the dict.
>>>> (3,) in a
Is (3,) one of the keys in the dict?
> True
Yes, it is.
>>>> (3,) is (3,)
Create two separate tuples (that happen to be equivalent). Are they the
same object?
> False
No, they are not.
Every time you write (3,), you are potentially creating a new object.
These objects have equal values (and hash codes), so they are
interchangeable for purposes of keying a dict.
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