Joining words together with a comma, and “and”

Question

I\'m working through \'Automate the Boring Stuff with Python\'. I can\'t figure out how to remove the final output comma from the program below. The goal is to keep promptin

Answer 1

I would do it using an f-string (a formatted string literal, available in Python 3.6+):

def grammatically_join(words, oxford_comma=False):
    if len(words) == 0:
        return ""
    if len(words) == 1:
        return listed[0]
    if len(words) == 2:
        return f"{listed[0]} and {listed[1]}"
    return f'{", ".join(words[:-1])}{"," if oxford_comma else ""} and {words[-1]}'

If you don't need the Oxford comma, then you can simplify the code and remove the extra edge case for len(words) == 2:

def grammatically_join(words):
    if len(words) == 0:
        return ""
    if len(words) == 1:
        return listed[0]
    return f'{", ".join(words[:-1])} and {words[-1]}'