Neither the else clause was executed because of the while loop was interrupted by the break keyword. We added a break statement for condition x holding the value 2, which will immediately terminate the while loop from that point, thus 3 was not printed. Let's add a break statement to our existing code, x = 1 The break keyword immediately terminates the while loop. Python comes with two inbuilt keywords to interrupt loop iteration, break and continue. We can see the else clause executes after the loop termination.īut wait! We can get a similar output even by just adding a print statement below, why use the else clause then?īecause else clause we will only execute when the loop gets terminated by itself, not by any interrupt like the break keyword. This can be better understood by the following example, x = 1 Python provides unique else clause to while loop to add statements after the loop termination.
WHILE LOOP PYTHON MAC
Nevertheless, if you ever get stuck in an infinite loop in Python press ctrl + c on Windows and cmd + c on Mac to exit the loop. In the fourth iteration, the while condition is no longer true as the value of x is now 4, therefore the while loop terminates.Ī quick note - You should be really careful while constructing a while loop because if you assign a condition which will never turn into False, the loop will run forever resulting into the infinite loop. Inside the loop first, we are printing the current value of x then incrementing the value of x by 1. In the above example we first assigned the value 1 to the variable x, then we constructed a while loop which will run until the value of x is less than or equal to 3. The condition we provide to the while statement is the controlling expression, our loop will run until the controlling statement is no longer true. In Python, a basic while loop looks like this: while : While loop favors indefinite iteration, which means we don't specify how many times the loop will run in advance.
WHILE LOOP PYTHON CODE
While Loop In PythonĪ while statement iterates a block of code till the controlling expression evaluates to True.
This article covers the construction and usage of While loops in Python. Loops allow programmers to set certain portions of their code to repeat through a number of loops which are referred to as iterations. Loops are an essential part of any programming language.
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