NameError: 变量未定义

如何解决NameError: 变量未定义

需要一些帮助。我创建了一个空列表来附加名称的输入。但是，我不断收到错误消息“NameError: name 'players' is not defined。如果我将玩家 = [] 定义为全局变量而不是主函数，它会起作用。仅供参考，我不允许使用全局变量.

def existingPlayers(name):
    '''
    Check if player name already exists
    '''
    for player in players:
        if player[0].lower() == name.lower():
            return True
    return False

def getPlayerNames():
    '''
    Get the names of the players. Check if the number of players and 
    player names are valid
    '''
    while True:
        name = input("Enter player name or <ENTER> to exit (min 2,max 4 players):")
        if len(name) == 0:
            if len(players) < 2:
                print(f"Minimum 2 players. Currently,{len(players)} player")
                continue
            else:
                break
        if existingPlayers(name):
            print("Repeated name. Choose another name")
            continue
        players.append([name])
        if len(players) == 4:
            break
def main():
    players = []
    getPlayerNames()
main()

解决方法

这是你想要的吗？

def existingPlayers(name,players):
    '''
    Check if player name already exists
    '''
    for player in players:
        if player[0].lower() == name.lower():
            return True
    return False

def getPlayerNames(players):
    '''
    Get the names of the players. Check if the number of players and 
    player names are valid
    '''
    while True:
        name = input("Enter player name or <ENTER> to exit (min 2,max 4 players):")
        if len(name) == 0:
            if len(players) < 2:
                print(f"Minimum 2 players. Currently,{len(players)} player")
                continue
            else:
                break
        if existingPlayers(name,players):
            print("Repeated name. Choose another name")
            continue
        players.append([name])
        if len(players) == 4:
            break
def main():
    players = []
    getPlayerNames(players)
main()