Python · Errors and files

Custom exception

A named exception lets callers handle your failures precisely.

pythonRunnable example python course

Syntax

class AppError(Exception): pass

Example

Open in the lab

class AppError(Exception):
    pass

try:
    raise AppError("save failed")
except AppError as error:
    print(error)

Reference pages are the quick answer. The course explains the why, shows the full example and ends with a challenge.