Iterators in Python (Theory)

• An iterator object is used to iterate through all items/values of a Iterable Object
• To iterate we need to get Iterator object from Iterable Object
• iter() and next() method are associated with Iterator object
• String, Tuple, List, Set and Dictionaries all are iterable objects
• There is built in iter() method, that is used to get Iterator object from an iterable object
• We can iterate all items of an iterable object using for loop as well
• For loop automatically create an Iterator object for an iterable object and call next() method for iterating through all items
• To create an object/class as an iterator you have to implement the methods __iter__() and __next__() to your object