Python 我的for循环出现问题，并收到以下消息：keyrerror:2

我得到了以下错误：Stats PlayerList=competitionList[j]keyrerror:2 我在competitionList中保存了许多列表，这是一本字典。我想遍历字典中列表中的所有对象

def Stats(competitionList, playerList):
        no_of_competitions = int(len(competitionList))
        x = (len(playerList))
        for i in range(no_of_competitions):
            for j in range (int(x)):
            #My error occurs here
                PlayerList=competitionList[j]
                for player in PlayerList: 
                    print("player: ", player.name)
                    print ("list :", player.name, player.victories)

---

错误只是在这一行中说明：

def Stats(competitionList, playerList):
        no_of_competitions = int(len(competitionList))
        x = (len(playerList))
        for i in range(no_of_competitions):
            for j in range (int(x)):
            #My error occurs here
                PlayerList=competitionList[j]
                for player in PlayerList: 
                    print("player: ", player.name)
                    print ("list :", player.name, player.victories)

PlayerList=competitionList[j]

dictionary competitionList不包含rangex中的一个键，在本例中为键2。确保：

def Stats(competitionList, playerList):
        no_of_competitions = int(len(competitionList))
        x = (len(playerList))
        for i in range(no_of_competitions):
            for j in range (int(x)):
            #My error occurs here
                PlayerList=competitionList[j]
                for player in PlayerList: 
                    print("player: ", player.name)
                    print ("list :", player.name, player.victories)

此范围内的所有值均显示在competitionList中 或者只迭代字典中实际存在的值 对于第二种选择，这应该简化事情并使其工作：

def Stats(competitionList, playerList):
        no_of_competitions = int(len(competitionList))
        x = (len(playerList))
        for i in range(no_of_competitions):
            for j in range (int(x)):
            #My error occurs here
                PlayerList=competitionList[j]
                for player in PlayerList: 
                    print("player: ", player.name)
                    print ("list :", player.name, player.victories)

for players in competitionList.values():
    for player in players:
        print("player: ", player.name)
        print ("list : ", player.name, player.victories)

---

您可以使用j访问competitionList。但是j指的是x，x是playerList的长度。玩家列表和竞赛列表可以延迟长度，这就是为什么会出现这种错误。

为什么要投int no_of_竞赛？它已经是一个整数了。换言之，说明错误：您的字典中没有整数2的键。谢谢，代码正在运行。一个小问题是，当你添加值时，它是如何工作的？看看，值检索字典的值，这是我们感兴趣的值。我们尤其可以忽略这个问题的关键。

def Stats(competitionList, playerList):
        no_of_competitions = int(len(competitionList))
        x = (len(playerList))
        for i in range(no_of_competitions):
            for j in range (int(x)):
            #My error occurs here
                PlayerList=competitionList[j]
                for player in PlayerList: 
                    print("player: ", player.name)
                    print ("list :", player.name, player.victories)