You will learn how to handle Python exceptions in this section. Further, you will learn to raise and catch exceptions. When an exception occurs in a program, the program execution is terminated. But most of the time, you don’t prefer the abnormal termination of the program, therefore you could use Python exceptions handling to avoid the crash of your program. For example, it can be used to check if a variable is None, as explained in [Checking if a Variable is None in Python](HowTo/Python/check if variable is none python.