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Python Loops

Python Loops

In this tutorial, we will learn about different types of loops in Python. We will cover the basics of for, while, and do-while loops.

What is a Loop

A loop is a control flow statement that allows code to be executed repeatedly based on a condition.

Loops

Python supports two types of loops: for loops and while loops. Although Python does not have a built-in do-while loop, it can be simulated using a while loop.

For Loop

A for loop is used when the number of iterations is known before entering the loop. The syntax for the for loop is:

for item in iterable:
    # Code block to be executed

While Loop

A while loop is used when the number of iterations is not known beforehand. The syntax for the while loop is:

while condition:
    # Code block to be executed

Simulating Do-While Loop

Although Python does not have a built-in do-while loop, it can be simulated using a while loop with a break statement. The syntax for simulating a do-while loop is:

while True:
    # Code block to be executed
    if not condition:
        break

Printing Numbers from 1 to 10 using For Loop

  1. Declare a range from 1 to 10.
  2. Use a for loop to print numbers from 1 to 10.

Python Program

for i in range(1, 11):
    print(i, end=' ')

Output

1 2 3 4 5 6 7 8 9 10

Printing Numbers from 1 to 5 using While Loop

  1. Declare an integer variable i and initialize it to 1.
  2. Use a while loop to print numbers from 1 to 5.

Python Program

i = 1
while i <= 5:
    print(i, end=' ')
    i += 1

Output

1 2 3 4 5

Printing Numbers from 1 to 3 using Simulated Do-While Loop

  1. Declare an integer variable i and initialize it to 1.
  2. Use a while loop to simulate a do-while loop to print numbers from 1 to 3.

Python Program

i = 1
while True:
    print(i, end=' ')
    i += 1
    if i > 3:
        break

Output

1 2 3