Explain Python While-loops

Question

Python while loops

Answer 1

The while loop is also known as a pre-tested loop. In general, a while loop allows a part of the code to be executed as long as the given condition is true.

It can be viewed as a repeating if statement. The while loop is mostly used in the case where the number of iterations is not known in advance.

The syntax is given below.

1. while expression:  
2.     statements  

Here, the statements can be a single statement or the group of statements. The expression should be any valid python expression resulting into true or false. The true is any non-zero value.

Example 1

1. i=1;  
2. while i<=10:  
3.     print(i);  
4.     i=i+1;  

Output:

1
2
3
4
5
6
7
8
9
10