import random

players = ['Harry', 'Hermione', 'Neville', 'Ginny']

teamA = []
teamB = []

def add_players_to_team():
    team_players = len(players)/2

    while len(players) > 0:
        for player in players:
            team = random.randint(0,1)
            if team == 0 and len(teamA) < team_players:
                teamA.append(player)
                players.remove(player)
            elif team == 1 and len(teamB) < team_players:
                teamB.append(player)
                players.remove(player)

    print('Team A = ', teamA)
    print('Team B = ', teamB)
    print('Players = ', players)

if len(players) % 2 == 0 and len(players) > 0:
    add_players_to_team()
else:
    print("\nThe player list can't be split between two teams")