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This diagram illustrates the basic logic of the break statement: The break statement

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You should think of it as a red "stop sign" that you can use in your code to have more control over the behavior of the loop.Īccording to the Python Documentation: The break statement, like in C, breaks out of the innermost enclosing for or while loop. This statement is used to stop a loop immediately. The loop runs until CTRL + C is pressed, but Python also has a break statement that we can use directly in our code to stop this type of loop. If we write this while loop with the condition i > while True: This can affect the number of iterations of the loop and even its output. Here we have a basic while loop that prints the value of i while i is less than 8 ( i > numsĮxactly what we expected, the while loop stopped when the condition len(nums) (greater than) instead of >= (greater than or equal to) (or vice versa).

#1 true 2 false game how to#

Now that you know how while loops work and how to write them in Python, let's see how they work behind the scenes with some examples. Tabs should only be used to remain consistent with code that is already indented with tabs. 💡 Tip: The Python style guide (PEP 8) recommends using 4 spaces per indentation level. If a statement is not indented, it will not be considered part of the loop (please see the diagram below). This block of code is called the "body" of the loop and it has to be indented. The sequence of statements that will be repeated.A colon ( :) at the end of the first line.A condition to determine if the loop will continue running or not based on its truth value ( True or False ).

The while keyword (followed by a space).This is the basic syntax: While Loop (Syntax) 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.

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We have to update their values explicitly with our code to make sure that the loop will eventually stop when the condition evaluates to False. One of the most important characteristics of while loops is that the variables used in the loop condition are not updated automatically.

When the condition evaluates to False, the loop stops and the program continues beyond the loop.

If the condition evaluates to True again, the sequence of statements runs again and the process is repeated.

The while loop condition is checked again.

If the condition is True, the statements that belong to the loop are executed.

The condition is evaluated to check if it's True or False.

The process starts when a while loop is found during the execution of the program.

Now that you know what while loops are used for, let's see their main logic and how they work behind the scenes. We can't know in advance when this will happen, so this is another perfect scenario for a while loop.

Games: In a game, a while loop could be used to keep the main logic of the game running until the player loses or the game ends.

For example, the Binary Search algorithm can be implemented using a while loop.

Search: searching for an element in a data structure is another perfect use case for a while loop because we can't know in advance how many iterations will be needed to find the target value.

Therefore, a while loop would be perfect for this scenario. We can't possibly know in advance how many times the user will enter an invalid input before the program can continue.

User Input: When we ask for user input, we need to check if the value entered is valid.

These are some examples of real use cases of while loops: 💡 Tip: if the while loop condition never evaluates to False, then we will have an infinite loop, which is a loop that never stops (in theory) without external intervention. When we write a while loop, we don't explicitly define how many iterations will be completed, we only write the condition that has to be True to continue the process and False to stop it.

This type of loop runs while a given condition is True and it only stops when the condition becomes False. They are used to repeat a sequence of statements an unknown number of times. Let's start with the purpose of while loops. 🔅 🔹 Purpose and Use Cases for While Loops You will learn how while loops work behind the scenes with examples, tables, and diagrams.Īre you ready? Let's begin.

How to use a break statement to stop a while loop.

What while True is used for and its general syntax.

What infinite loops are and how to interrupt them.

While loops are very powerful programming structures that you can use in your programs to repeat a sequence of statements. Welcome! If you want to learn how to work with while loops in Python, then this article is for you.