Python 3 - Second Edition

A.4    Built-In Exceptions

Python also contains a set of built-in exception types. These exceptions are raised by functions of the standard library or by the interpreter itself. They are built-in, which means they can be used at any time in the source code. Table A.4 lists the built-in exception types and common circumstances in which they occur. The inheritance hierarchy is indicated by the indentation depth of the type name.

Exception Type	Appearance
BaseException	Base class of all built-in exception types (see Chapter 20, Section 20.1.1)
SystemExit	When exiting the program via sys.exit. This exception doesn’t cause a traceback.
KeyboardInterrupt	When exiting the program via a key combination (usually Ctrl+C).