Mastering Exception Handling: Manually Raising Exceptions in Python

 In Python, you can manually raise an exception using the raise statement. The raise statement allows you to create and raise your own exceptions to handle specific situations in your code. Here's an example of how to manually raise an exception:

def divide_numbers(a, b):
    if b == 0:
        raise ZeroDivisionError("Cannot divide by zero")
    return a / b

try:
    result = divide_numbers(10, 0)
except ZeroDivisionError as e:
    print("An error occurred:", str(e))

In the above example, the divide_numbers function takes two arguments, a and b, and attempts to divide a by b. However, before performing the division, it checks if b is zero. If it is, the raise statement is executed, creating and raising a ZeroDivisionError exception with a custom error message.

The try-except block is used to catch the raised exception. In this case, we catch the ZeroDivisionError and print a custom error message along with the exception's string representation.

When you run this code, you'll see the following output:

An error occurred: Cannot divide by zero

Manually raising exceptions gives you the flexibility to handle exceptional cases in your code and provide meaningful error messages to assist with debugging. You can raise built-in exceptions like ValueError, TypeError, or create your own custom exception classes by inheriting from the Exception base class.