SpreadTooThin wrote: > I'm really worried that python may is doing some things I wasn't > expecting... but lets see... > > 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?
by not modifying your arguments nilly-willy, of course. > 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.... http://www.effbot.org/pyfaq/how-do-i-copy-an-object-in-python.htm but if you find yourself needing to copy things a lot, you need to look over your design. well-designed Python code seldom needs to copy object values. </F> -- http://mail.python.org/mailman/listinfo/python-list
