python - 将 .csv 导入字典

Question

我正在尝试将 .csv 文件导入字典。 我的麻烦是，当我尝试从字典中读取时，我没有得到输出？ 为什么？？

.csv 文件看起来像这样:

F59241,GG1212
F65563,QQ434
F59226,WW343
F69215,CC434

我试过的是:

import csv

with open('myfile.csv', mode='r') as infile:
    reader = csv.reader(infile,)
with open('mtfile.csv', mode='w') as outfile:
    writer = csv.writer(outfile)
DICT = {rows[0]:rows[1] for rows in reader}
n = ['F59241', 'F65563', 'F59226', 'F69215']

for key in n:
    if DICT.get(key):
        print ((key) + ' : ' + DICT[key])
    else:
        print((key) + ' : ' + "Not Available")

谁能告诉我我做错了什么？ 谢谢

Answer 1

当您退出 block 时，with 构造关闭文件。您需要首先使用 block 读取 infile 中的数据

import csv

with open('myfile.csv', mode='r') as infile:
    reader = csv.reader(infile,)
    DICT = {rows[0]:rows[1] for rows in reader if len(rows) == 2}
    print DICT

n = ['F59241', 'F65563', 'F59226', 'F69215']

for key in n:
    if DICT.get(key):
        print ((key) + ' : ' + DICT[key])
    else:
        print((key) + ' : ' + "Not Available")