How to Use For, While, and Nested Loops in Python

Python supports three types of Loop statements. Those are While, For and Nested Loop. Loops also called iterations.

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In my previous posts, I have added an example of how to Calculate the Area of Circle and Factorial ‘n’.

FOR, WHILE and NESTED LOOPS in Python and their syntax.

For example, to display (factorial n), you need a logic to execute as a loop and to print factorial n values.

Python Loops

1. While Loop Flow Chart

Python WHILE Loop Syntax

while test_condition:
        body of loop

Infinite Loops

A loop becomes an infinite loop if a condition never becomes FALSE.

The programmer must be cautious when using while loops because of the possibility that the test_condition never evaluates to a FALSE value

2. Nested WHILE and FOR Loops

Python Nested While Loop

while test_condition:
      while test_condition:
      statement(s)
      statement(s)

Python Nested For Loop

for val in sequence:
        for val in sequence:
        statement(s)
        statement(s)

In the above, WHILE and FOR nested-loops, you can find a Loop within the Loop.

3. FOR Loop Flow Chart

Python FOR Loop Syntax

for val in sequence:
        statement(s)

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