When you want to create a loop in Python, you generally have two choices: the while loop and the for loop. while is simple: it just repeats until a given condition is no longer true.

In simple terms, if a list has 5 items and you try to use the 10th item in a list in Python, it will return an IndexError: list index out of range. Usually, these errors are easy to troubleshoot but ...

Many programs have a need to iterate over a large list of generated data. The conventional way to do this would be to calculate the values for the list and populate it, then loop over the whole thing.