Here, we use a counter variable to print the string Inside loop three times. Hence, a while loop's else part runs if no break occurs and the condition is false. The while loop can be terminated with a break statement. The else part is executed if the condition in the while loop evaluates to False. Same as with for loops, while loops can also have an optional else block. Failing to do so will result in an infinite loop (never-ending loop). This is very important (and mostly forgotten). We need to increase the value of the counter variable in the body of the loop. In the above program, the test expression will be True as long as our counter variable i is less than or equal to n (10 in our program). When you run the program, the output will be: Enter n: 10 Flowchart of while Loop Flowchart for while loop in Python Example: Python while Loop # Program to add natural Python interprets any non-zero value as True. The body starts with indentation and the first unindented line marks the end. These two statements will get executed only if the condition is True. The body of the while loop consists of print (n) and n n + 1. The condition of the while loop is n < 10.
In Python, the body of the while loop is determined through indentation. Let’s print the first 10 natural numbers using a while loop. This process continues until the test_expression evaluates to False. After one iteration, the test expression is checked again. The body of the loop is entered only if the test_expression evaluates to True.
In the while loop, test expression is checked first. We generally use this loop when we don't know the number of times to iterate beforehand.
#PYTHON WHILE LOOP CODE#
In this Python Tutorial, we learned what a while loop is, its syntax, working mechanism of While loop, nested while loop and much more with examples.The while loop in Python is used to iterate over a block of code as long as the test expression (condition) is true. Python While Loop with Multiple Conditions.Python Pattern Programs using While Loop.Python Programs based on While Loopįollowing are references to some of the tutorials that use while loop in different scenarios. Infinite while loop is a loop in which the condition is always True and never comes out of the loop. More about Python While Loop with Continue Statement.
#PYTHON WHILE LOOP UPDATE#
Make sure that you update the control variables participating in the while loop condition, before you execute the continue statement. But, when we get an odd number, we will continue the loop with next iterations. In this example, we shall write a Python program with while loop to print numbers from 1 to 20. Python Continue statement can be used to skip the execution of further statements in while loop body and continue with next iteration of while loop. More about Python While Loop with Break Statement. This break statement breaks the while loop. And inside this if-statement we have break statement. The while loop has a break statements that executes conditionally when i becomes 7. In the following example, we have a while loop statement. Python Break statement can be used inside a looping statement to break the loop even before condition becomes False. Using this nested while loop, we print a start pattern. Its like while in while which is nested while loop. In the following example, we will write a while loop statement inside another while loop. Print Start Pattern using Nested While Loop And these statements could be another while loop, If statement, If-Else statement or For Loop statement or any valid Python statement. The body of while loop consists of statements. In the following program, we have a while loop statement that prints multiples of 3 in the range of 3 to 30. Example While Loop Statement to Print Multiples of 3
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