Need to create a while loop in Python?
If so, I’ll show how to create this type of loop using 4 simple examples.
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.
Create While Loop in Python – 4 Examples
Example-1: Create a Countdown
In the first example, you’ll see how to create a countdown, where:
- The countdown will start at 10
- The value of the countdown will decrease by intervals of 1
- The countdown will stop at 4
Based on the above rules, the condition for the countdown is therefore:
countdown > 3
And so long as this condition is true, the countdown will decrease by intervals of 1.
Here is the full Python code to perform the while loop for our example:
countdown = 10 while countdown > 3: print ('CountDown = ', countdown) countdown = countdown - 1
Once you run the code, you’ll get the following countdown:
Example-2: Use a Break
Sometimes you may want to use a ‘break’ statement to end the loop when a specific condition is met.
You can then achieve the same outcome as in example 1 by including a break statement as follows:
countdown = 10 while countdown > 0: print ('CountDown = ', countdown) countdown = countdown - 1 if countdown == 3: break
And when you run the code, you’ll indeed get the same result as in the first example:
Example-3: Counting Up
You just saw how to count down, but what if you want to count up?
In this example, you’ll start counting from 1, and then stop at 9 (each time increasing the value of the count by 1).
And so, in this case, the condition will be:
10 > increment > 0
Putting everything together, the Python code would look like this:
increment = 1 while 10 > increment > 0: print ('Increment = ', increment) increment = increment + 1
And the result:
Example-4: Counting Up with a Break
Let’s now see how to use a ‘break’ statement to get the same result as in example 3:
increment = 1 while increment > 0: print ('Increment = ', increment) increment = increment + 1 if increment == 10: break
Run the code and you’ll indeed get the same results as in the third example: