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How to use For and While Loops in Python. Why Loops? All programming languages need ways of doing similar things many times, this is called iteration. For Loop The for statement is used to iterate over the elements of a sequence. The while loop in Python is used to iterate over a block of code as long as the test expression condition is true. We generally use this loop when we don't know beforehand, the number of times to iterate. Syntax of while Loop in Python while test_expression: Body of while In while loop, test expression is checked first. 2. Else Clause with Python While Loop. In Python, we can add an optional else clause after the end of “while” loop. The code inside the else clause would always run but after the while loop finishes execution. The one situation when it won’t run is if the loop exits after a “break” statement. Python while-else loop - In the last article, we have covered the first loop statement in Python, for-else statement. In this article, we are going to learn about another loop statement - while-else loop. There are some differences as far as syntax and their working patterns are concerned, which we will be studying in this tutorial. Lets begin!

15/12/2019 · A while loop statement in Python programming language repeatedly executes a target statement as long as a given condition is true. Here, statements may be a single statement or a block of statements with uniform indent. The condition may be any expression, and true is. 12/12/2019 · Test your understanding of Python while loops. Take this quiz after reading our Python “while” Loops Indefinite Iteration tutorial. The quiz contains 9 questions and there is no time limit. You’ll get 1 point for each correct answer. At the end of the quiz, you’ll receive a total score. While loops. Usage in Python. When do I use them? While loops, like the ForLoop, are used for repeating sections of code - but unlike a for loop, the while loop will not run n times, but until a defined condition is no longer met.

15/12/2019 · Python break, continue and pass Statements - You might face a situation in which you need to exit a loop completely when an external condition is triggered or there may also be a situation when you want to. Python 3 This is a tutorial in Python3, but this chapter of our course is available in a version for Python 2.x as well: While Loops in Python 2.x. Training Classes This website aims at providing you with educational material suitable for self-learning. Doing loop while list has indexes in python. Ask Question Asked 8 years, 3 months ago. Active 1 year, 7 months ago. Viewed 57k times 3. 4. Let's say we have list with unknown number of indexes, is it possible to do something like. i=0 while. Python knows the usual control flow statements that other languages speak — if, for, while and range — with some of its own twists, of course. More control flow tools in Python 3 Python is a programming language that lets you work quickly and integrate systems more effectively.

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