python - Can I create a class which can be unpacked? -

for example:

x = (1, 2) a,b = x 

now i'd accomplish in case of x being instance of class isn't list or tuple. overriding __getitem__ or __getslice__ doesn't work:

class test(object):     def __getitem__(self, key):         return 1  a,b = test() 

results in valueerror: many values unpack. can make work without inheriting list or tuple (or respective userx classes)? or under-the-hood magic cannot use?

you need override __iter__ or __getitem__. here's example using __iter__:

class test(object):     def __iter__(self):         return iter([1, 2])  a,b = test() 

be careful, __iter__ needs return iterator. easiest way either wrap data structure in iter, or have yield generator.

for example of using __getitem__, see jonrsharpe's excellent answer.