Exceptions

Introduction

Errors detected during execution are called exceptions and are not unconditionally fatal. Most exceptions are not handled by programs; it is possible to write programs that handle selected exceptions. There are specific features in Python to deal with exceptions and exception logic. Furthermore, exceptions have a rich type hierarchy, all inheriting from the BaseException type.

Syntax

• raise exception
• raise # re-raise an exception that’s already been raised
• raise exception from cause # Python 3 - set exception cause
• raise exception from None # Python 3 - suppress all exception context
• try:
• except [exception types] [ as identifier ]:
• else:
• finally: