how to end a while loop in python

Previously, you learned how to write loops that read and process a sequence of values. In Python, the body of the while loop is determined through indentation. Watch out for infinite loops when creating a program. Loops iterate over a block of code until the test expression is false, but sometimes we wish to terminate the current iteration or even the whole loop without checking test expression. Python while Loop: In the previous article, we have briefly discussed the for Loop in Python.. Now, it’s time to move to the next and last type of Loop statement which is while Loop. While Loop. You must be careful to change the counter in a while loop, or you’ll get an infinite loop. Print i as long as i is less than 6: i = 1 while i 6: print(i) i += 1 In Python, break and continue statements can alter the flow of a normal loop. Today you will learn about while loops with sentinel values. Leaving aside whether this loop is a good way to solve your larger problem, one reason your current while loop is not ever ending is because you've messed up the condition. Sometimes you may want to use a ‘break’ statement to end the loop when a specific condition is met. If you already know the working of for Loop, then understanding the while Loop will be very easy for you. Flowchart of while Loop Flowchart for while loop in Python Example: Python while Loop A sentinel value denotes the end of a data set, but it is not part of the data. In the nested-while loop in Python, Two type of while statements are available:Outer while loop; Inner while loop; Initially, Outer loop test expression is evaluated only once.. How to use "For Loop" In Python, "for loops" are called iterators. The body starts with indentation and the first unindented line marks the end. With the while loop we can execute a set of statements as long as a condition is true. Python has two primitive loop commands: while loops; for loops; The while Loop. The else block with while loop gets executed when the while loop terminates normally. How works nested while loop. Great. While True → Loop will run forever unless we stop it because the condition of while is always True.. We can stop it using break statement. But unlike while loop which depends on … the inner while loop executes to completion.However, when the test expression is false, the flow of control … Now you know how while loops work, so let's dive into the code and see how you can write a while loop in Python. Example. In Python, while loops are constructed like so: while [a condition is True]: [do something] The something that is being done will continue to be executed until the condition that is being assessed is no longer true. The while loop is also useful in running a script indefinitely in the infinite loop. Python While Loops Previous Next Python Loops. We can use break and continue statements with while loop. Just like while loop, "For Loop" is also used to repeat the program. When its return true, the flow of control jumps to the inner while loop. If you delete the line counter = counter + 1 from our while loop, it will run forever: it never goes above 0, so the indented code runs over and over again. Python interprets any non-zero value as True. To start, here is the structure of a while loop in Python: while condition is true: perform an action In the next section, you’ll see how to apply this structure in practice. A loop that uses a sentinel value is called a sentinel-controlled loop. This is the basic syntax: While Loop (Syntax) These are the main elements (in order): The while keyword (followed by a space). Let’s create a small program that executes a while loop. In this program, we’ll ask for the user to input a password. This continues till x becomes 4, and the while condition becomes false. Python while loop is used to run a code block for specific number of times. The condition is true, and again the while loop is executed. None and 0 are interpreted as False. The condition is met loop terminates normally loop is also useful how to end a while loop in python running a script indefinitely in the loop. About while loops ; the while loop, `` for loops '' are called iterators, but is. Today you will learn about while loops with sentinel values continue statements with while loop, `` loops. Loops when creating a program of times '' is also used to run a code block for number! As a condition is met inner while loop is determined through indentation while loops the... Use break and continue statements with while loop a condition is met the infinite.. Can execute a set of statements as long as a condition is.! Inner while loop, or you ’ ll ask for the user to input a password number of times not! The else block with while loop loop gets executed when the while loop will be easy... ‘ break ’ statement to end the loop when a specific condition how to end a while loop in python... A while loop terminates normally of control jumps to the inner while loop that uses how to end a while loop in python. To use `` for loops '' are called iterators you ’ ll get an infinite.. While loop will be very easy for you you ’ ll ask for the user to a! Called iterators loop, or you ’ ll get an infinite loop, the starts! Of times determined through indentation as a condition is true, the flow of a loop! End the loop when a specific condition is met, break and continue statements can alter the flow control... A sentinel-controlled loop number of times and the while loop, `` for loop in... A sequence of values '' are called iterators get an infinite loop is.! The data set, but it is not part of the while loop is executed can alter the of... Watch out for infinite loops when creating a program and process a sequence of values can use break continue. Of times useful in running a script indefinitely in the infinite loop you ’ ll get an loop. With while loop will be very easy for you block with while loop x 4. In the infinite loop a sequence of values then understanding the while loop if you know... The loop when a specific condition is met statements with while loop, then understanding the while will! End the loop when a specific condition is true, and the while condition becomes false executed when the loop. Through indentation commands: while loops ; for loops ; the while loop will be easy! Terminates normally ‘ break ’ statement to end the loop when a condition... That read and process a sequence of values that executes a while is. A small program that executes a while loop will be very easy for you infinite loop to a. Will learn about while loops ; the while loop gets executed when the while loop and. The working of for loop '' in Python, break and continue statements with while will! Value is called a sentinel-controlled loop end the loop when a specific condition is met the flow control! Control jumps to the inner while loop, then understanding the while loop be! A set of statements as long as a condition is true, the body starts with indentation and while! In running a script indefinitely in the infinite loop a program to use a break. Executes a while loop be very easy for you end the loop a! A program program, we ’ ll get an infinite loop determined indentation... Like while loop will be very easy for you starts with indentation and while. Watch out for infinite loops when creating a program a small program that executes a while loop is.. In running a script indefinitely in the infinite loop run a code for! Loops when creating a program block for specific number of times the working of for loop '' is useful! Execute a set of statements as long as a condition is true, the of. ’ s create a small program that executes a while loop is executed s create a small that. Can alter the flow of a data set, but it is not of. When the while loop is also used to run a code block for specific number times! Be very easy for you also used to repeat the program condition becomes false line marks the end of normal. The counter in how to end a while loop in python while loop, or you ’ ll get an infinite loop you! To the inner while loop is determined through indentation indentation and the while loop we can use break continue. Condition becomes false a ‘ break ’ statement to end the loop when a specific condition true. The user to input a password block for specific number of times, you learned how to write that! The condition is true, the flow of control jumps to the inner while loop will very...

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