ValueError：Python中已关闭文件的readline

Question

这是我的代码：

import csv

with open('test.csv', 'rb') as csvfile:
    x = csv.reader(csvfile,delimiter=',',quotechar='|')

for row in x:
    print (row)

我收到以下错误：

ValueError: readline of closed file

可能是什么问题？

Answer 1

您的缩进无序

import csv

with open('test.csv', 'rb') as csvfile:
    x = csv.reader(csvfile,delimiter=',',quotechar='|')

    for row in x:
        print (row)

是正确的缩进

行with open('test.csv', 'rb') as csvfile:创建一个文件对象，但在块结束后调用该文件的__close__方法。与在Python中一样，非缩进关闭块，当您编写for row in x:时，您已退出块。因此x现已关闭，您无法对此执行任何操作。

Answer 2

您的代码没有正确缩进。将rb替换为r。

import csv

with open('test.csv','r') as csvfile:
    x = csv.reader(csvfile,delimiter=',',quotechar='|')

    for row in x:
        print (row)