python - 字典仅打印并保存最后一项

Question

我有一个问题，当我尝试打印 csv 文件的所有行时，字典仅保存并打印最后一行。我试图找出我做错了什么，我希望找到答案。

import csv

data = open(r"C:\Desktop\file.csv")
dataReader = csv.reader(data, delimiter = ";")
count = 0
for row in dataReader:
    bookList= dict()
    bookList[row[0]]= row[1]
    print(row)
for k,v in bookList.items():
        print(k,v)

Answer 1

出现问题的原因是您为循环的每次迭代创建了一个新的字典实例。在开始时、循环之前创建一次:

import csv
data = open(r"C:\Desktop\file.csv")
dataReader = csv.reader(data, delimiter = ";")
count = 0
bookList = dict()
for row in dataReader:
    bookList[row[0]]= row[1]
    print(row)
for k,v in bookList.items():
        print(k,v)