出错Traceback

import random
import csv

#数据读取
with open('Prostate_Cancer.csv','r')as file:
    reader=csv.DictReader(file)
    dates=[row for row in  reader]
#分组
random.shuffle(dates)#数据打乱顺序
n=len(dates)//3

#测试
test_set=dates[0:n]
#训练
train_set=dates[n:]

#KNN
#距离
def distance(d1,d2):
    res=0

    for key in("radius","texture","perimter","area","smoothness","compactness","symmetry","fractal","dimension"
):
        res+=(float(d1[key])-float(d2[key]))**2

    return  res**0.5
K=5
def knn(data):
    #距离
    res=[
        {"result":train['distance_result'],"distance":distance(data,train)}
        for train in train_set
    ]
knn(test_set[0］

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编辑一直都没问题突然就这样了

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