Using try vs if in python

Question

Is there a rationale to decide which one of try or if constructs to use, when testing variable to have a value?

For example, there is a f

Answer 1

As a general rule of thumb, you should never use try/catch or any exception handling stuff to control flow. Even though behind the scenes iteration is controlled via the raising of StopIteration exceptions, you still should prefer your first code snippet to the second.