Create a python programming using looping and counting

Loops are used in programming to repeat a specific block of code. In this article, you will learn to create a while loop in Python.

Video: Python while Loop

What is while loop in Python?

The while loop in Python is used to iterate over a block of code as long as the test expression [condition] is true.

We generally use this loop when we don't know the number of times to iterate beforehand.

Syntax of while Loop in Python

while test_expression:
    Body of while

In the while loop, test expression is checked first. The body of the loop is entered only if the test_expression evaluates to True. After one iteration, the test expression is checked again. This process continues until the test_expression evaluates to False.

In Python, the body of the while loop is determined through indentation.

The body starts with indentation and the first unindented line marks the end.

Python interprets any non-zero value as True. None and 0 are interpreted as False.

Flowchart of while Loop

Example: Python while Loop

# Program to add natural
# numbers up to 
# sum = 1+2+3+...+n

# To take input from the user,
# n = int[input["Enter n: "]]

n = 10

# initialize sum and counter
sum = 0
i = 1

while i