Decrement in while loop in Python

By Sourav Dutta

This tutorial will help you to understand how to do decrement in while loop in Python.

In programming, we use a loop to execute repeatedly a block of statements until a specific condition (loop-control statement) is met. In Python, we have two different types of loop. Those are –

• while loop
• for loop

In a while loop, we can execute the statements inside it’s loop body repeatedly as long as the loop control statement is true.

Syntax – while loop

while (loop-control statement):

#loop body

statement(s)

How to perform decrement in while loop in Python

If the loop-control statement is true, Python interpreter will start the executions of the loop body statement(s). After that, we need to use an Arithmetic Operator/Counter to increment or decrement it’s value. After incrementing/decrementing it’ll again check the loop-control statement whether it’s true or not.  If the loop-control statement is still true it’ll run the statements inside the loop body again otherwise it’ll exit from the loop. In this article, I’ll discuss about decrement in a while loop in Python. To understand this concept let’s take an example:

n=10
while (n>=0):     #loop control-statememt
    print (n)     #loop body
    n-=1          #decrementing the value by 1

Output :

10
9
8
7
6
5
4
3
2
1
0