Difference between iterator and for loop in Python

As adjectives the difference between repeated and iterative is that repeated is having been said or done again while iterative is of a procedure that involves repetition of steps (iteration) to achieve the desired outcome ; in computing this may involve a mechanism such as a loop.

Iteration means executing the same block of code over and over, potentially many times. A programming structure that implements iteration is called a loop .

Difference between the two traversals In for-each loop, we can’t modify collection, it will throw a ConcurrentModificationException on the other hand with iterator we can modify collection . Modifying a collection simply means removing an element or changing content of an item stored in the collection.

When a for loop is executed, for statement calls iter() on the object, which it is supposed to loop over. If this call is successful, the iter call will return an iterator object that defines the method __next__() , which accesses elements of the object one at a time.