from random import choice
teamA = []
teamB = []

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

def add_player_to_team(team):

    for i in range(2):
        player_picked = choice(players)
        team.append(player_picked)
        players.remove(player_picked)

add_player_to_team(teamA)
print(teamA)
add_player_to_team(teamB)
print(teamB)