Automate the boring stuff with Python: Comma Code

Question

Currently working my way through this beginners book and have completed one of the practice projects \'Comma Code\' which asks the user to construct a program which:

Answer 1

def sample(values):
    if len(values) == 0:
         print("Enter some value")
    elif len(values) == 1:
        return values[0]
    else:
        return ', '.join(values[:-1] + ['and ' + values[-1]])

spam = ['apples', 'bananas', 'tofu', 'cats']
print(sample(spam))