On Apr 25, 1:56 am, Peter Otten <[EMAIL PROTECTED]> wrote: > Aaron Brady wrote: > >>>> f.func_defaults[0] > > [2, 3] > >>>> f.func_defaults[0]+=[4] > > Traceback (most recent call last): > > File "<stdin>", line 1, in <module> > > TypeError: 'tuple' object does not support item assignment > >>>> f.func_defaults[0] > > [2, 3, 4] > > > V. interesting. Operation succeeds but with a throw. Er, raise. > > This is not specific to func_defaults: > > >>> t = ([1],) > >>> t[0] += [2] > > Traceback (most recent call last): > File "<stdin>", line 1, in <module> > TypeError: 'tuple' object does not support item assignment>>> t > > ([1, 2],) > > t[0] += [2] > > is resolved to > > t.__setitem__(t[0].__iadd__([2])) > > where list.__iadd__() succeeds but __setitem__() fails (because tuples don't > have that method). > > Peter
Curious why t.__setitem__ is called. Wouldn't it still refer to the same list? -- http://mail.python.org/mailman/listinfo/python-list
