While loop in Python

September 10, 2020 8,482 Comments

Python While:

In while loop, if the expression becomes true, only then the block of statements present inside the while loop will be executed.

If the condition is false then whatever statements after that while loop will not execute.

But in for loop the  loop will execute till the last elements of that sequence.Read our article for loop here.

Syntax:
while condition/expression:

     # execute these statements
     ......

Below the loop there is a indent block, the loop will run as per the condition.

Example:
num = 1
while num < 10:
    print (num)
    num = num +1

Output:

1
2
3
4
5
6
7
8
9

Explanation:

  • The loop will execute as long as the num < 10
  • Here we are incrementing the loop by num = num +1
  • where num will increment  and run till it reaches 10.

While Loop with else statement:

The else block will execute only if the condition is false or not satisfied as mention above.

Syntax:

while condition: 
     # execute these statements 
else: 
     # execute these statements
Example:
num = 1
while num < 5:
    print (num)
    num = num +1

else:
    print ('End of while loop')

Output:

1
2
3
4
End of while loop

Explanation:

  • In above loop the loop run for 4 times till it reaches 5.
  • Then it jumps to else block, execute that statement and exit from the program.

Hope you understood while loop .

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