If the else statement is used with a while loop, the else statement is executed when the condition becomes false. If the else statement is used with a for loop, the else statement is executed when the loop has exhausted iterating the list. Python supports having an else statement associated with a loop statement. The above example goes in an infinite loop and you need to use CTRL+C to exit the program. While var = 1 : # This constructs an infinite loopĮnter a number :Traceback (most recent call last): Such a loop is called an infinite loop.Īn infinite loop might be useful in client/server programming where the server needs to run continuously so that client programs can communicate with it as and when required. You must be cautious when using while loops because of the possibility that this condition never resolves to a FALSE value. The Infinite LoopĪ loop becomes infinite loop if a condition never becomes FALSE. With each iteration, the current value of the index count is displayed and then increased by 1. The block here, consisting of the print and increment statements, is executed repeatedly until count is no longer less than 9. When the above code is executed, it produces the following result − When the condition is tested and the result is false, the loop body will be skipped and the first statement after the while loop will be executed. Here, a key point of the while loop is that the loop might not ever run. Python uses indentation as its method of grouping statements. In Python, all the statements indented by the same number of character spaces after a programming construct are considered to be part of a single block of code. When the condition becomes false, program control passes to the line immediately following the loop. The loop iterates while the condition is true. The condition may be any expression, and true is any non-zero value. Here, statement(s) may be a single statement or a block of statements with uniform indent. The syntax of a while loop in Python programming language is − Because neither of the conditions in the parentheses are met, the code stops executing.A while loop statement in Python programming language repeatedly executes a target statement as long as a given condition is true. The reason for this a is less than 4 and b is greater than 3 after the third iteration. We can see here that the code stops after the third iteration. # Hello! The value of a is 6, the value of b is 4, and the value of c is 7. # Hello! The value of a is 3, the value of b is 7, and the value of c is 6. # Hello! The value of a is 0, the value of b is 10, and the value of c is 5. To see how we can stop a while loop in Python, let’s take a look at the example below: a = 0 Because of this, we need to be careful about executing a while loop. The program would run indefinitely, until the condition is not longer True. In the example above, the while loop will complete the step do something indefinitely, until the condition is no longer met. Let’s take a quick look at how a while loop is written in Python: while : A Python while loop is both an example of definite iteration, meaning that it iterates a definite number of times, and an example of indefinite iteration, meaning that it iterates an indefinite number of times. A while loop is similar to a Python for loop, but it is executed different. How to Group Multiple Conditions in a Python While LoopĪ Python while loop is an example of iteration, meaning that some Python statement is executed a certain number of times or while a condition is true.Using a NOT Operator in a Python While Loop with Multiple Conditions.Python While Loop with Multiple Conditions Using OR.Python While Loop with Multiple Conditions Using AND.
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