Python while Loops

In Python, while loops are used to execute a block of code repeatedly as long as a certain condition is met. The basic syntax of a while loop is as follows:

1while condition:
2    # execute this block of code as long as the condition is True

The condition can be any expression that evaluates to a Boolean value (True or False). As long as the condition is True, the code in the while loop will be executed. Once the condition becomes False, the while loop will exit and the program will continue with the next statement.

For example, the following code will print the numbers from 1 to 5:

1x = 1
2while x <= 5:
3    print(x)
4    x += 1

Output:

11
22
33
44
55

It is important to note that if the condition in a while loop is always true, the loop will never exit and the program will run indefinitely, resulting in an infinite loop. Therefore, it is crucial to ensure that the loop's condition will eventually evaluate to False.

You can also use the break statement to exit a while loop prematurely if a certain condition is met. For example, the following code will print the numbers from 1 to 5 and exit the loop if the number is equal to 4:

1x = 1
2while x <= 5:
3    if x == 4:
4        break
5    print(x)
6    x += 1

Output:

11
22
33

Another useful statement to use with while loops is the continue statement, which skips the current iteration of the loop and continues with the next iteration. For example, the following code will print all the numbers from 1 to 5 except 3:

1x = 1
2while x <= 5:
3    if x == 3:
4        x += 1
5        continue
6    print(x)
7    x += 1

Output:

11
22
34
45

Python while loops are used to execute a block of code repeatedly as long as a certain condition is met. The while loop allows you to execute a block of code repeatedly until the condition is False. It is important to ensure that the loop's condition will eventually evaluate to False to avoid infinite loops. You can also use the break statement to exit a while loop prematurely if a certain condition is met, and the continue statement to skip the current iteration and continue with the next iteration. Understanding how to use while loops and the different statements that can be used with them is an essential part of becoming proficient in Python programming.