[PIPython] copy() di dizionari

[Carlo C8E Miron]

Il 28/04/05, M.Buso<mbposta a postino.it> ha scritto:
> a={ 
>     "a":1, 
>     "b":2, 
>     "c": { # dizionario interno 
>             "a1":10, 
>             "b1":20, 
>                         } 
>         } 
>   
> b=a.copy() 
>  
> a["c"]["a1"]="99"
>  
> print b["c"]["a1"]
> 99  
>   
> Come si puo' evitare questo? 

vedi >>> help("copy")
>>> import copy
>>> b = copy.deepcopy(a)

> come mai copy() non funziona con i dizionari interni? 

>>> help(dict.copy)
Help on method_descriptor:
copy(...)
    D.copy() -> a shallow copy of D

> Qualcuno puo' darmi qualche spiegazione. 

il metodo effettua una copia "superficiale", piu' veloce e quindi
migliore come default. per gli altri casi c'e' il modulo copy.

> Grazie 

HTH,
(c)

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