Custom Python Exceptions with Error Codes and Error Messages

Question

class AppError(Exception):
    pass

class MissingInputError(AppError):
    pass

class ValidationError(AppError):
    pass

...

def v         


        

Answer 1

Here's a quick example of a custom Exception class with special codes:

class ErrorWithCode(Exception):
    def __init__(self, code):
        self.code = code
    def __str__(self):
        return repr(self.code)

try:
    raise ErrorWithCode(1000)
except ErrorWithCode as e:
    print("Received error with code:", e.code)

Since you were asking about how to use args here's an additional example...

class ErrorWithArgs(Exception):
    def __init__(self, *args):
        # *args is used to get a list of the parameters passed in
        self.args = [a for a in args]

try:
    raise ErrorWithArgs(1, "text", "some more text")
except ErrorWithArgs as e:
    print("%d: %s - %s" % (e.args[0], e.args[1], e.args[2]))