How to write custom Python Exceptions with Error Codes and Error Messages?

Python Server Side Programming Programming

I have an application App with error codes and error messages like this in the code below.

class AppError(Exception): pass
class BlahBlahError(AppError):
# definition of the error codes & messages
messerr = {101: " Certain error here. Please verify.", \
102: “Another one here. Please verify.", \
103: "One more here. Please verify.", \
104: "That was a bloomer!. Please verify."}

How do I write custom python exceptions with error codes and error messages?

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1 Answer

Rajendra Dharmkar

Answered on 6th Dec, 2017

We can write custom exception classes with error codes and error messages as follows:

class ErrorCode(Exception):
    def __init__(self, code):
        self.code = code
   
try:
    raise ErrorCode(401)
except ErrorCode as e:
    print "Received error with code:", e.code

We get output

C:/Users/TutorialsPoint1/~.py
Received error with code: 401

We can also write custom exceptions with arguments, error codes and error messages as follows:

class ErrorArgs(Exception):
    def __init__(self, *args):
        self.args = [a for a in args]
try:
    raise ErrorArgs(403, "foo", "bar")
except ErrorArgs as e:
    print "%d: %s , %s" % (e.args[0], e.args[1], e.args[2])

We get following output

C:/Users/TutorialsPoint1/~.py
403: foo , bar

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How to write custom Python Exceptions with Error Codes and Error Messages?

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