raise valueerror in python

You can raise a ValueError in Python using the raise keyword. Here's an example:

main.py
def validate_age(age):
    if age < 0:
        raise ValueError("Age must be a positive integer")
    # Rest of the code
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In this example, we have a function validate_age that checks if the age is a positive integer. If the condition is not met, we raise a ValueError with a custom error message.

When this error is raised, it will terminate the current execution and look for an exception handler (try-except block) to handle the error.

You can customize the error message to provide more relevant information about the raised ValueError.

Remember to use error handling techniques like try-except blocks to catch and handle the raised ValueError appropriately.