Nested Loop in Python

 Nested Loop

       Python programming language allows to use one loop inside another loop. Loop defined within another loop is know as nested loops. Nested loops are the loops that are nested inside an existing loop, that is, nested loops are the body of another loop.

Syntax 

for iterator-var in sequence:

     for var in sequence:

               statement(s) for inner loop

               # inner loop closed

     statement(s) for outer loop

     # outer loop closed

Other statement(s)

Example

for i in range(1,9,2):

        for j in range(i):

               print(i,end='')

       print()

Output

1

3 3 3

5 5 5 5 5

7 7 7 7 7 7 7 

Note : The range() function defaults to increment the sequence by 1, however it is possible to specify the increment value by adding a third parameter.

Example

for x in range(3,31,3):

      print(x)                       # table of 3

Output

3

6

9

12

15

18

21

24

27

30

Note :   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.