Linkoteca. Try/Except

The try except statement can handle exceptions. Exceptions may happen when you run a program.

Exceptions are errors that happen during execution of the program. Python won’t tell you about errors like syntax errors (grammar faults), instead it will abruptly stop.

An abrupt exit is bad for both the end user and developer.

Instead of an emergency halt, you can use a try except statement to properly deal with the problem. An emergency halt will happen if you do not properly handle exceptions.

The idea of the try-except block is this:

• try: the code with the exception(s) to catch. If an exception is raised, it jumps straight into the except block.
• except: this code is only executed if an exception occured in the try block. The except block is required with a try block, even if it contains only the pass statement.

It may be combined with the else and finally keywords.

• else: Code in the else block is only executed if no exceptions were raised in the try block.
• finally: The code in the finally block is always executed, regardless of if a an exception was raised or not.