How do I use __getitem__ and __iter__ and return values from a dictionary?

Question

I have an object with a dictionary that I want to access via __getitem__ as well as iterate over (values only, keys don\'t matter) but am not sure how to do it.

Answer 1

__getitem__(self,key), where key is a integer, as your self.books is a dictionary and you can not do self.books[integer]

e.g:

>>>d = {'a':'sdsdsd','b':'sfsdsd'}
>>d[0]

d[0]
Traceback (most recent call last):
  File "", line 1, in 
KeyError: 0

the iteration protocol goes like this:

The iterator protocol consists of two methods. The __iter__() method, which must return the iterator object and the next() method, which returns the next element from a sequence. previously when __iter__ method was not defined, it fell back to __getitem__ by successively calling __getitem__ with increasing values till it gives index out of range error.