Not sure why this isn't right. Have I misunderstood the question?

import re

class Players:

    string = '''Love, Kenneth: 20
    Chalkley, Andrew: 25
    McFarland, Dave: 10
    Kesten, Joy: 22
    Stewart Pinchback, Pinckney Benton: 18'''

    players = re.compile(r'''
        ^(?P<last_name>[-\w\s?]+)
        ,\s
        (?P<first_name>[-\w\s?]+)
        :\s
        (?P<score>[\d]+)$
    ''', re.I|re.M|re.X)

    def __init__(self):
        self.last_name = []
        self.first_name = []
        self.score = []
        for match in self.players.finditer(self.string):    
            self.last_name.append('{last_name}'.format(**match.groupdict()))
            self.first_name.append('{first_name}'.format(**match.groupdict()))
            self.score.append('{score}'.format(**match.groupdict()))