如何知道何时到达文本文件的底部

Question

所以我有一个文本文件，里面有我程序用户的详细信息。你知道吗

在我的程序中，我有一个从这个文本文件中检索数据的登录系统，但我不知道如何判断何时到达它的末尾。你知道吗

文本文件中的数据示例如下所示：

Bob, Bob15, football, 15

我的代码如下：

username = input("Enter username: ")
password = input("Enter password: ")

file = open("userDetails.txt", "r")
match = False
while match == False:
    finished = False
    while finished == False:
        for each in file:
            each = each.split(", ")
            realUser = each[1]
            realPass = each[2]
            if realUser == username and realPass == password:
                match = True
                finished = True
                print("match")
            elif each == "":
                finished = False
                username = input("Re-enter username: ")
                password = input("Re-enter password: ")
                match = False
            else:
                finished = False

我不确定的部分是elif each == "":部分。你知道吗

有什么想法吗？你知道吗

Answer 1

当循环结束到达文件结尾时，正确的代码为：

file = open("userDetails.txt", "r")
match = False
while match == False:
    for each in file:
        each = each.split(", ")
        realUser = each[1]
        realPass = each[2]
        if realUser == username and realPass == password:
            match = True
            print("match")
        elif each == "":
            username = input("Re-enter username: ")
            password = input("Re-enter password: ")
            match = False