Source.Python forums

from commands.say import SayCommand
from players.entity import Player
from messages import SayText2
from commands import CommandReturn

@SayCommand('!rs')
def _rs_say_command(command, index, team):
    player = Player(index)
    player.kills = 0
    player.deaths = 0

    SayText2('You have reset your score.').send(index)

    return CommandReturn.BLOCK

@SayCommand('!rs')
def reset_score(command, index, team_only):
    player = Player(index)
    ...