andrew cooke wrote: > Diez B. Roggisch wrote: >> That's not a local variable, that is a default argument. Which is in >> fact only created once for each function, yes. >> >> http://effbot.org/pyfaq/why-are-default-values-shared-between-objects.htm > > a nice way of handling this was posted here just yesterday, which isn't in > the ffbot page (afaik): > > def function(listvar=None): > # None will force use of empty list here: > for x in listvar or []: > # Do soemthing with contents here > > or just > > def function(listvar=None): > listvar = listvar or [] > ... > > although the "if arg is None..." is pretty standard python that makes it > clear exactly what you are doing.
Plus, it works as expected (read: modifies the argument) if you explicitly pass an empty list to the function... Peter -- http://mail.python.org/mailman/listinfo/python-list
