The raising of an exception interrupts normal program flow and transfers control to an exception handler.

Exception handlers are defined using the try … except construct.

The try blocks define a context in which exceptions can be detected.

Corresponding the except blocks define handlers for specific types of exceptions.

Python uses exceptions pervasively and many built-in language features depend on them.

The except blocks can capture an exception object, which is often of a standard type such as ValueError, KeyError or IndexError.

Programmer errors such as IndentationError and SyntaxError should not normally be handled.

Exceptional conditions can be signaled using the raise keyword which accepts a single parameter of an exception object.

Raise without an argument within an except block re-raises the exception which is currently being processed.

We tend not to routinely check for TypeErrors. To do so would negate the flexibility afforded to us by Python's dynamic type system.

The exception...