How to raise custom exceptions in Python

2 years ago
Noah Thompson
1 minute

To throw a custom exception, you can follow these steps:

  1. Firstly, create a new custom exception class that inherits from the built-in Exception class. Additional properties or methods can be added according to your needs.
class MyException(Exception):
    pass
  1. to increase or elevate
raise MyException("This is a custom exception.")

The complete sample code is as follows:

class MyException(Exception):
    pass

def divide(a, b):
    if b == 0:
        raise MyException("Division by zero is not allowed.")
    return a / b

try:
    result = divide(10, 0)
except MyException as e:
    print(e)

The output is:

Division by zero is not allowed.

In this example, a custom exception class instance MyException is thrown and the exception information is printed when the divisor b is 0.

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