User Define Exception in python3.9 | Try, Except, Raise Finally | Python tutorial for beginners
User Define Exception in python3.9 | Try, Except, Raise Finally | Python tutorial for beginners
Python has numerous built-in exceptions that force your program to output an error when something in the program goes wrong.
However, sometimes you may need to create your own custom exceptions that serve your purpose.
In Python, users can define custom exceptions by creating a new class. This exception class has to be derived, either directly or indirectly, from the built-in Exception class. Most of the built-in exceptions are also derived from this class.
When we are developing a large Python program, it is a good practice to place all the user-defined exceptions that our program raises in a separate file. Many standard modules do this. They define their exceptions separately as exceptions.py or errors.py (generally but not always).
User-defined exception class can implement everything a normal class can do, but we generally make them simple and concise. Most implementations declare a custom base class and derive others exception classes from this base class. This concept is made clearer in the following example.
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