While

The while statement is used to execute code many times.

while.py

count = 0

while count < 5:
    count = count + 1
    print(count)

print("Done.")

Output:

1
2
3
4
5
Done.

NOTE: Don't forget to increment count otherwise the loop will never stop. This is called an infinite loop.

The following program prints the 2 times table.

times_table.py

count = 0

while count < 5:
    count = count + 1
    print(count, "* 2 is", count * 2)

print("Done.")

Output:

1 * 2 is 2
2 * 2 is 4
3 * 2 is 6
4 * 2 is 8
5 * 2 is 10
Done.

Links

• Beginner's Guide

Exercises (5 mins)

1. Take the times_table.py and do the 3 times table.

   Output:

   1 * 3 is 3
   2 * 3 is 6
   3 * 3 is 9
   4 * 3 is 12
   5 * 3 is 15
   Done.
   

2. Take the times_table.py and do the calculation for any number.

   Output:

   Enter a number:4
   1 *  4  is 4
   2 *  4  is 8
   3 *  4  is 12
   4 *  4  is 16
   5 *  4  is 20
   Done.
   
   Enter a number:5
   1 *  5  is 5
   2 *  5  is 10
   3 *  5  is 15
   4 *  5  is 20
   5 *  5  is 25
   Done.