python - 代码未读取文件，错误对象 Len() MASTERLIST

Question

这是我第一次在这里发帖。我正在做一项作业，但我遇到了困难。

Here is what my professor is asking for - click to see the screenshot

这是我的代码:

option1=open("BrandVB.txt", "r")
option2=open("BrandA.txt", "r")
option3=open("BrandC.txt", "r")
option4=open("BrandX.txt", "r")

#Creating a master lits
li = [option1, option2,option3, option4]

#Searching part numbers based on brand
brand=input("Enter the brand: ")
for i in range(len(li)):
    for j in range(len(li[i])):
        if brand==li[i][j]:
            pos=j
for i in range(len(li)):
    print(li[i][pos])

我得到的错误是:

Traceback (most recent call last):
  File "/Users/admin/Desktop/Desktop/LAB10/LAB10.py", line 17, in <module>
    for j in range(len(li[i])):
TypeError: object of type '_io.TextIOWrapper' has no len()

Answer 1

仅仅打开文件是不够的，您还需要从中.read()。这是一种方法:

with open("BrandVB.txt", "r") as a, open("BrandA.txt", "r") as b, open("BrandC.txt", "r") as c, open("BrandX.txt", "r") as d:
    option1 = a.read()
    option2 = b.read()
    option3 = c.read()
    option4 = d.read()

<小时/>

Python - Reading and Writing Files