Marc 'BlackJack' Rintsch wrote: > In <[EMAIL PROTECTED]>, SpreadTooThin > wrote: > > > I'm really worried that python may is doing some things I wasn't > > expecting... but lets see... > > Expect that Python never copies something if don't ask explicitly for a > copy. > > > if I pass a list to a function def fn(myList): > > > > and in that function I modify an element in the list, then does the > > callers list get modied as well. > > > > def fn(list): > > list[1] = 0 > > > > myList = [1, 2, 3] > > print myList > > fn(myList) > > print myList > > > >>>> [1,2,3] > >>>> [1,0,3] > > > > How can I avoid this? In this case this is a really simplified example > > but the effects are the same... > > In this case: > > def fn(lst): > lst = list(lst) > lst[1] = 0 > > > > How do I specify or create deep copies of objects that may contain > > other objects that may contain other object that may contain other > > objects.... > > See the `copy` module especially `copy.deepcopy()`. > I'm aware of __deepcopy__ but does that mean that every object in the object needs to have its own deep copy? And how do I ensure that?
> Ciao, > Marc 'BlackJack' Rintsch -- http://mail.python.org/mailman/listinfo/python-list
