Question

Explain the while loop in python with an example​

Answer 1

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The while loop in Python is used to iterate over a block of code as long as the test expression (condition) is true. We generally use this loop when we don't know the number of times to iterate beforehand.

Example :-

Example 1: while loop

When i is 1, the test expression i <= 5 is true. Hence, the body of the while loop is executed. This prints 1 on the screen and the value of i is increased to 2. Now, i is 2, the test expression i <= 5 is again true.

Answer 2

Explanation:

Python Loops

Python has two primitive loop commands:

>while loops

>for loops

The while Loop

With the while loop we can execute a set of statements as long as a condition is true.

Example

Print i as long as i is less than 6:

i = 1

while i < 6:

 print(i)

 i += 1

Note: remember to increment i, or else the loop will continue forever.

The while loop requires relevant variables to be ready, in this example we need to define an indexing variable, i, which we set to 1.

The break Statement

With the break statement we can stop the loop even if the while condition is true:

Example

Exit the loop when i is 3:

i = 1

while i < 6:

 print(i)

 if i == 3:

   break

 i += 1

The continue Statement

With the continue statement we can stop the current iteration, and continue with the next:

Example

Continue to the next iteration if i is 3:

i = 0

while i < 6:

 i += 1

 if i == 3:

   continue

 print(i)

The else Statement

With the else statement we can run a block of code once when the condition no longer is true:

Example

Print a message once the condition is false:

i = 1

while i < 6:

 print(i)

 i += 1

else:

 print("i is no longer less than 6")