range() and Definite Iteration

range(stop) returns a sequence of numbers from 0 (the default) up to but NOT including stop, incrementing by 1 (the default).

A simple use of a for loop runs some code a specified number of times using the range() function.

Think of range(5) as generating this list: [0, 1, 2, 3, 4]. The code above is equivalent to:

The loop variable does not have to be used inside the body. If you only want to repeat something a set number of times, ignore it.

range(start, stop) counts from start up to but NOT including stop, incrementing by 1 (the default).

The for loop is an example of a definite iteration. We can determine ahead of time the number of times the loop repeats. Later, we will talk about indefinite iteration, a loop where we cannot predict the number of times a loop repeats.