Question

我正在使用Python 3.6.3。

我正在尝试从csv文件验证用户名和密码。用户名和后续密码在文本文件中的新行上，因此当附加到我称为“up”的空数组时，它被转换为2d数组，每行都有一个列表在“up”中。我要求用户输入用户名和密码。那么我尝试使用for循环（ for x in up ）通过 up [up.index（x）] 循环遍历每个列表，然后使用 .index（用户名）直接在一个名为j的变量（ j = up [up.index（x）]。index（username））中。代码将被给出，我突出显示的部分有问题。这些是csv文件的内容：Text File

当我运行代码时，它会返回一个错误，指出 用户名不在列表中。 我搜索了答案但找不到任何内容。有什么东西我忽略了吗？

感谢任何帮助。

import csv

validoption = ["i","u"]

while True:

    option = input("Sign in or sign up\nPlease enter 'i' to sign in or 'u' to sign up: ")
    if option in validoption:
        if option is "i":
            with open("login.txt","r") as l:
                up = []
                read = csv.reader(l)
                count = 0
                for line in read:
                    up.append(line)
                    count=+1
                invalid = True
                while invalid:
                    username = input("Please enter your username: ")
                    password = input("Please enter your password: ")
                    if [[y is username for y in x] for x in up]:
                        for x in up:
                            j = up[up.index(x)].index(username)
                            if password in up[up.index(x)][j+1]:
                                invalid = False
                            else:
                                print("Password is incorrect")
                    else:
                        print("Username is not recognised")
        else:
            with open("login.txt","a") as l:
                username = input("Please enter your username: ")
                while True:
                    password = input("Please enter your password\nPlease make sure that your password is longer than 8 characters, has a capiatal letter and a number: ")
                    if len(password)<8:
                        if any(p.isupper() for p in password):
                            if any(p.isdigit() for p in password):
                                break
                            else:
                                print("Password must have one number in it\n")
                        else:
                            print("Password must have one capital letter\n")
                    else:
                        print("Password must have more than 8 charaters")
                userdetails = username+","+password
                l.write(userdetails)
                l.write("\n")

谢谢：）

Answer 1

y is username测试两个值是否为相同的对象，而不是等效对象。请改用==。

此外，您应该考虑使用用户名作为dict的密钥，然后您可以使用in并消除应用程序代码中的某些循环。

Python-3.6 - “不在列表中”错误

1 个答案: