My python program keeps returning "KeyError: 20"

Question

我在 python 中编写了一个程序，它应该 return 每个级别得分最高的玩家，但是它在第 69 行保持 returning "KeyError: 20" （ P_L1=players_TS[H_L1] ），我不知道如何解决这个问题。在我的代码中，我打开一个名为 "playerScores.txt" 的文本文件，其格式如下：
月亮,3,15
StarPlayer,2,18
艾莉,5,9
等等
这是我的代码：

    print("The highest scorers for each leve are:\n")
    PS3=open("PlayerScores.txt","r").read().split("\n")
    level1_scores=[]
    players_TS={}
    level2_scores=[]
    players_T2={}
    level3_scores=[]
    players_T3={}
    level4_scores=[]
    players_T4={}
    level5_scores=[]
    players_T5={}

    for line in PS3:
        lines=line.split(",")
        player=lines[0]
        level=lines[1]
        score=lines[2]

        erros=open("scoreboard_errorlog.text","w")

        if int(score)>20:
            errors.write(score)
        if int(level)>5:
            errors.write(level)

        if int(level)==1:
            level1_scores.append(int(score))
            players_TS.setdefault(score,[]).append(player)
        if int(level)==2:
            level2_scores.append(int(score))
            players_T2.setdefault(score,[]).append(player)
        if int(level)==3:
            level3_scores.append(int(score))
            players_T3.setdefault(score,[]).append(player)
        if int(level)==4:
            level4_scores.append(int(score))
            players_T4.setdefault(score,[]).append(player)
        if int(level)==5:
            level5_scores.append(int(score))
            players_T5.setdefault(score,[]).append(player)

    H_L1=max(level1_scores)
    P_L1=players_TS[H_L1]
    H_L2=max(level2_scores)
    P_L2=players_T2[H_L2]
    H_L3=max(level3_scores)
    P_L3=players_T3[H_L3]
    H_L4=max(level4_scores)
    P_L4=players_T4[H_L4]
    H_L5=max(level5_scores)
    P_L5=players_T5[H_L5]

    print("Level\tPlayer name\tScore\nLevel 1\t",P_L1,"\t",H_L1,"\nLevel 2\t",P_L2,"\t",H_L2,"\nLevel 3\t",P_L3,"\t",H_L3,"\nLevel 4\t",P_L4,"\t",H_L4,"\nLevel 5\t",P_L5,"\t",H_L5)

非常感谢您的帮助。

Answer 1

问题出在这里：

if int(level)==1:
    level1_scores.append(int(score))
    players_TS.setdefault(score,[]).append(player)

假设score == "20"。您正在将 integer 20 添加到 level1_scores，但使用 string "20" 作为键players_TS。然后，当你到达这些行时

H_L1=max(level1_scores)
P_L1=players_TS[H_L1]

H_L1是整数值20，但players_TS中的所有键都是字符串，如"20"。由于 20 != "20"，KeyError 个结果。

您可能希望 score（就此而言 level）始终是一个整数，因此在解析后立即转换一次，然后使用 score就像循环的其余部分一样。

for line in PS3:
    lines = line.split(",")
    player = lines[0]
    level = int(lines[1])
    score = int(lines[2])

    with open("scoreboard_errorlog.text","w") as errors:

        if score > 20:
            errors.write(score)
        if level > 5:
            errors.write(level)

    if level == 1:
        level1_scores.append(score)
        players_TS.setdefault(score,[]).append(player)
    elif level == 2:
        level2_scores.append(score)
        players_T2.setdefault(score,[]).append(player)
    elif level == 3:
        level3_scores.append(score)
        players_T3.setdefault(score,[]).append(player)
    elif level == 4:
        level4_scores.append(score)
        players_T4.setdefault(score,[]).append(player)
    elif level == 5:
        level5_scores.append(score)
        players_T5.setdefault(score,[]).append(player)

    H_L1 = max(level1_scores)
    P_L1 = players_TS[H_L1]
    H_L2 = max(level2_scores)
    P_L2 = players_T2[H_L2]
    H_L3 = max(level3_scores)
    P_L3 = players_T3[H_L3]
    H_L4 = max(level4_scores)
    P_L4 = players_T4[H_L4]
    H_L5 = max(level5_scores)
    P_L5 = players_T5[H_L5]

但是，您还应该使用 dicts 来存储大量此类数据，而不是单独命名的变量。

level_scores = {level: [] for level in range(1,6)}
players = {}
for line in PS3:
    lines = line.split(",")
    player = lines[0]
    level = int(lines[1])
    score = int(lines[2])

    # Use append mode, or you overwrite the file each time through the loop
    with open("scoreboard_errorlog.text", "a") as errors:

        if score > 20:
            errors.write(score)
        if level > 5:
            errors.write(level)
            continue

    level_scores[level].append(score)
    players[level].setdefault(score,[]).append(player)


H = {}
P = {}
for level in range(1,6):
    H[level] = max(level_scores[level])
    P[level] = players[level][H[level]]

My python program keeps returning "KeyError: 20"

My python program keeps returning "KeyError: 20"

python

dictionary

python-3.x

keyerror