How do I change elements in a list?

[Bruno Desthuilliers]

Just Another Victim of the Ambient Morality a écrit :
>     How do you change certain elements in a list?  I'm looking to do the 
> Python equivalent of this Ruby code:
> 
> 
> ->  first = [1, 2]
> =>  [1, 2]
> ->  second = first
> =>  [1, 2]
> ->  first.map! {|i| i + 1}
> =>  [2, 3]
> ->  first
> =>  [2, 3]
> ->  second
> =>  [2, 3]
> 
> 
>     I need to change a list, in place, so other variables referencing that 
> list also see the change.

first = [1,2]
second = first
first[:] = [i+1 for i in first]

HTH