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Python - Raise Custom Errors / Exceptions
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  Custom Exception

Here, we have created a user-defined exception called CustomError which is derived from the Exception class. This new exception can be raised, like other exceptions, using the raise statement with an optional error message.

class CustomError(Exception):
       pass

x = 1

if x == 1:
    raise CustomError('This is custom error')

Output:

Traceback (most recent call last):
  File "error_custom.py", line 8, in <module>
    raise CustomError('This is custom error')
__main__.CustomError: This is custom error
  Catch custom Exception

This example shows how to catch custom Exception

class CustomError(Exception):
     pass

try:
    raise CustomError('Can you catch me ?')
except CustomError as e:
    print ('Catched CustomError :{}'.format(e))
except Exception as e:
    print ('Generic exception: {}'.format(e))

Output:

Catched CustomError :Can you catch me ?



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