To recap, the `while` loop statement repeatedly executes a code block while a particular condition is `True`. We use a `while` loop when the number iteration is not fixed.

We will learn how to use a `while` loop inside another `while` loop.

# Printing numbers from 0 to 4 for 5 times
i = 0
# Setting outer while loop
while i < 5:
  j = 0
  # Setting inner while loop
  while j < 5:
    print(j, end='')
    j += 1
  i += 1
  print('')

In the last section, we worked with a matrix. We can do the same using a nested `while` loop!

matrix = [ [1, 2, 4, 29],
           [3, 4, 6, 1] ]

# Printing all elements of the matrix
i = 0
# Setting outer while loop to work with the number of rows
while i < len(matrix):
  j = 0
  # Setting inner while loop to work with the number of elements in the row
  while j < len(matrix[i]):
    print(matrix[i][j], end = ' ')
    j +=1
  i += 1
  print('')

We start learning Python loops with the for loop. A for loop is used for iterating over a sequence. Let's go!

With the while loop, we can execute a set of statements as long as a condition is true. We are going to work with this loop and handle different problems!

A nested loop is a loop inside a loop. Sound difficult? Don't worry! We will handle this loop!

Python Loops Tutorial

Nested while Loop

Task