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

I didn't dig through all the answers but I did see someone suggested using join. I agree but since this question didn't come in the book before learning joins my answer was this.

def To_String(my_list)
    try:
        for index, item in enumerate(my_list):
            if index == 0:                       # at first index
                myStr = str(item) + ', '
            elif index < len(my_list) - 1:       # after first index
                myStr += str(item) + ', '
            else:
                myStr += 'and ' + str(item)      # at last index
        return myStr  

    except NameError:
        return 'Your list has no data!'

spam = ['apples', 'bananas', 'tofu', 'cats']

my_string = To_String(spam)

print(my_string)

Result:

apples, bananas, tofu, and cats