Binding a variable?
Kent Johnson
kent37 at tds.net
Fri Oct 21 13:28:46 EDT 2005
Paul Dale wrote:
>
> Hi everyone,
>
> Is it possible to bind a list member or variable to a variable such that
No, Python variables don't work that way.
>
> temp = 5
The name 'temp' is now bound to the integer 5. Think of temp as a pointer to an integer object with value 5.
>
> list = [ temp ]
the name 'list' is bound to a list whose only member is a reference to the integer 5
>
> temp == 6
Ok now temp is bound to a new integer, but the list hasn't changed - it's member is still a reference to 5
>
> list
>
> would show
>
> list = [ 6 ]
You have to put a mutable object into the list - something whose state you can change. For example this works, because temp and lst[0] are references to the same mutable (changeable) list:
>>> temp = [6]
>>> lst = [temp]
>>> lst
[[6]]
>>> temp[0] = 5
>>> lst
[[5]]
Kent
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