Many levels of __getitem__ in Python

Question

What to use to get more than one argument from another class? I need something like getitem () but with that i can get only 1.

class Example(object):

    def __init__(self, ex1, ex2, ex3):
        self.ex1 = ex1
        self.ex2 = ex2
        self.ex3 = ex3
   #just example, this will not work
   def __getitem__(self, ex1, ex2, ex3):
   return self.ex1, self.ex2, self.ex3

Answer 1

Python combines more than one argument of [...] into a tuple:

class Example(object):

    def __init__(self, ex1, ex2, ex3):
        self.ex1 = ex1
        self.ex2 = ex2
        self.ex3 = ex3

    def __getitem__(self, index):
       ex1, ex2, ex3 = index
       return self.ex1, self.ex2, self.ex3

ex = Example(1,2,3)
print ex[1,2,3]

Answer 2

You need to do it like this.

A.__getitem__() returns and another object with its own B.__getitem__() in which turn returns C.__getitem()__ . Then you can do

b = a["1"]
c = b["2"]

which is equivalent of saying

 c = a["1"]["2"]