Lecture 38:- While Loops In Python

In Python, a while loop is used to execute a block of code repeatedly as long as a given condition is true. The loop continues to execute the code block until the condition becomes false. The general syntax of a while loop is as follows:

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while condition:    # Code block to execute while the condition is true

The condition is an expression that is evaluated before each iteration of the loop. If the condition evaluates to True, the code block inside the loop is executed. After the execution of the code block, the condition is evaluated again. If the condition remains True, the loop continues to execute the code block again, and this process repeats until the condition becomes False.

Here's an example of a simple while loop that prints numbers from 1 to 5:

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count = 1 while count <= 5:    print(count)    count += 1

Output:

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1 2 3 4 5

In this example, the count variable is initialized to 1. The while loop is set to run as long as the condition count <= 5 is true. During each iteration of the loop, the current value of count is printed, and then the count variable is incremented by 1 using count += 1. The loop continues until the count variable becomes 6, at which point the condition count <= 5 becomes False, and the loop terminates.

It's essential to ensure that there is a mechanism within the loop to eventually make the condition False, so the loop can end. Otherwise, the loop will become an infinite loop and continue indefinitely, which can lead to your program becoming unresponsive. To avoid infinite loops, make sure to include appropriate code to modify the condition during the execution of the loop.