Rich Healey wrote:
> http://docs.python.org/library/copy.html
>
> Just near the bottom it reads:
>
> """Shallow copies of dictionaries can be made using dict.copy(), and
> of lists by assigning a slice of the entire list, for example,
> copied_list = original_list[:]."""
>
>
> Surely this is a typo? To my understanding, copied_list =
> original_list[:] gives you a clean copy (slicing returns a new
> object....)
>
Yes, but it's a shallow copy: the new object references exactly the same
objects as the original list (not copies of those objects). A deep copy
would need to copy any referenced lists, and so on.
> Can this be updated? Or someone explain to me why it's correct?
>
It sounds correct to me.
regards
Steve
> Cheers
>
> Example:
>
>
>>>> t = [1, 2, 3]
>>>> y = t
>>>> u = t[:]
>>>> y[1] = "rawr"
>>>> t
> [1, 'rawr', 3]
>>>> u
> [1, 2, 3]
--
Steve Holden +1 571 484 6266 +1 800 494 3119
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