Python Raise an Exception: How to Raise Exceptions with Examples

In Python, exceptions are used to handle errors and unexpected situations during program execution. The raise statement allows developers to manually trigger an exception when a specific condition occurs.

What Is the raise Statement in Python?

The raise statement is used to explicitly raise an exception. It is helpful when you want to stop program execution or notify users that an invalid condition has occurred.

Syntax:

raise ExceptionType("Error message")

Example of Raising an Exception

age = -5

if age < 0:
    raise ValueError("Age cannot be negative")

print("Valid age")

In this example, Python raises a ValueError because the age is negative.

Why Use raise in Python?

The raise statement is useful for:

• Validating user input.

• Enforcing business rules.

• Handling invalid values.

• Creating custom error messages.

• Controlling program flow when an error occurs.

You can also raise a custom exception by defining a class that inherits from Exception.

Learn More About Python Exceptions

If you want to understand exception handling in more detail, explore the Python Raise an Exception tutorial on TPointTech. It provides practical examples and explains how to use the raise statement effectively in Python programs.