Error handling by raising an error

Another way to raise an error is by using raise. In this exercise, you will add a raise statement to the shout_echo() function you defined before to raise an error message when the value supplied by the user to the echo argument is less than 0.

The call to shout_echo() uses valid argument values. To test and see how the raise statement works, simply change the value for the echo argument to a negative value. Don't forget to change it back to valid values to move on to the next exercise!

This exercise is part of the course

Introduction to Functions in Python

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Exercise instructions

Complete the if statement by checking if the value of echo is less than 0.
In the body of the if statement, add a raise statement that raises a ValueError with message 'echo must be greater than or equal to 0' when the value supplied by the user to echo is less than 0.

Hands-on interactive exercise

Have a go at this exercise by completing this sample code.

# Define shout_echo
def shout_echo(word1, echo=1):
    """Concatenate echo copies of word1 and three
    exclamation marks at the end of the string."""

    # Raise an error with raise
    if ____:
        ____ ____(____)

    # Concatenate echo copies of word1 using *: echo_word
    echo_word = word1 * echo

    # Concatenate '!!!' to echo_word: shout_word
    shout_word = echo_word + '!!!'

    # Return shout_word
    return shout_word

# Call shout_echo
shout_echo("particle", echo=5)

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