Python Nested Loops

Python programming language allows using one loop inside another loop. The following section shows a few examples to illustrate the concept. 

Syntax of Python Nested for Loop

The syntax for a nested for loop statement in Python programming language is as follows:

for iterator_var in sequence:
    for iterator_var in sequence:
        statements(s)
        statements(s)

Syntax of Python Nested while Loop

The syntax for a nested while loop statement in Python programming language is as follows:

while expression:
    while expression: 
        statement(s)
        statement(s)

A final note on loop nesting is that we can put any type of loop inside of any other type of loop. For example, a for loop can be inside a while loop or vice versa. 

Output:

1
2 2
3 3 3
4 4 4 4

Python programming language provides the following types of loops to handle looping requirements.