How can I avoid making an infinite loop?


#1

Question

How can I avoid making an infinite loop?

Answer

Any time you write a while loop, you should ensure that the condition you are checking eventually becomes False.
This can be difficult depending on what your condition is, because it can be hard to know all of the cases under which your program could be executed. For example, if we have a function being called in our condition, and that function has special cases that can be tricky to handle, we might not see the reason for our infinite loop so easily.
For example, say we have a program that has a function named is_valid_temperature() that returns True if the given number is a valid temperature on Earth and False otherwise. If we use this function in our while condition, we must take into consideration how that function calculates its True or False output, which is a bit more complicated than just checking a count being less than some value.


FAQ: Learn Python- Loops - Infinite loops