The second type of error is a runtime error. A program with a runtime error is one that passed the interpreter’s syntax checks, and started to execute. However, during the execution of one of the statements in the program, an error occurred that caused the interpreter to stop executing the program and display an error message. Runtime errors are also called exceptions because they usually indicate that something exceptional (and bad) has happened.
Python cannot reliably tell if you are trying to divide by 0 until it is executing your program (e.g., you might be asking the user for a value and then dividing by that value—you cannot know what value the user will enter before you run the program).
Forgetting a colon at the end of a statement where one is required.
This is a problem with the formal structure of the program. Python knows where colons are required and can detect when one is missing simply by looking at the code without running it.
Forgetting to divide by 100 when printing a percentage amount.
This will produce the wrong answer, but Python will not consider it an error at all. The programmer is the one who understands that the answer produced is wrong.
Your teacher and instructor may be able to find most of your runtime errors, but only because they have experience looking at code and possibly writing code. With experience runtime errors are easier to find. But we also have an automated way of finding these types of errors.
