如何索引列表以查找特定值及其位置？

Question

我正在尝试编写一个代码，它将电影存储在一个列表中，我可以通过要求按位置添加电影或检查它是否在列表中来检索该列表。到目前为止，我一直在研究检索部分，但我不断收到错误消息，其中“'list' 对象的描述符'index' 不适用于'str' 对象”。 这是我目前的代码

myFile = open("movies.txt", "a")
more = "yes"
while more.lower() == "yes":
    movie = input("Please enter a movie title: ")
    myFile.write(movie + '\n')
    more = input("Would you like another item? Enter 'yes' or 'no'. ")
    find = input("Would you like to find a movie? Enter 'yes' or 'no'. ")
    myFile.close()
    if find == "yes":
        myFile = open("movies.txt")
        xlist = list[myFile]
        f2 = input("What movie would like to find?")
        f3 = xlist.index(f2)
        print(f2 + " is in number " + f3 + " on the list")

Answer 1

问题不在xlist 而是在f2，因为input() 返回字符串。如果输入数字 2，你的行看起来就像你写的：

f3 = xlist.index("2")

相反，将输入转换为整数：

try:
    f2 = int(input("What movie would like to find?"))
except ValueError:
    exit("Invalid number")

Answer 2

说明

在代码的第 11 行

xlist = list[myFile]

要制作包含在文件movies.txt 中的单词列表，您可以这样做

xlist=myFile.read().splitlines()

代码

myFile = open("movies.txt", "a")
more = "yes"
while more.lower() == "yes":
    movie = input("Please enter a movie title: ")
    myFile.write(f'{movie}\n')
    more = input("Would you like another item? Enter 'yes' or 'no'. ")
    find = input("Would you like to find a movie? Enter 'yes' or 'no'. ")
    myFile.close()
    if find == "yes":
        myFile = open("movies.txt")
        xlist=myFile.read().splitlines()
        print(xlist)
        f2 = input("What movie would like to find?")
        f3 = xlist.index(f2)
        print(f'{f2}  is in number {f3} on the list')

输出

Please enter a movie title: money-heist
Would you like another item? Enter 'yes' or 'no'. no
Would you like to find a movie? Enter 'yes' or 'no'. yes
['Dark', 'money-heist']
What movie would like to find?Dark
Dark  is in number 0 on the list