Python string.join ( list ) last entry with “and”

Question

What is an elegant way to join a list of sentence parts so that the result is \"a, b, and c\" where the list is [ \'a\', \'b\', \'c\' ]? Specifying

Answer 1

Assuming len(words)>2, you can join the first n-1 words using ', ', and add the last word using standard string formatting:

def join_words(words):
    if len(words) > 2:
        return '%s, and %s' % ( ', '.join(words[:-1]), words[-1] )
    else:
        return ' and '.join(words)