如何从Python2.7上的列表中选择名称

Question

更多帮助我的银行ATM学校项目。问题是，我创建了一个程序，允许用户在其他地方的保存中输入一个名称，但我无法从该保存中选择一个名称以供再次使用。这是我的密码。你知道吗

f1 =open('C:\NameAgeFile', 'r')
filedata = f1.read()
f1.close()

print filedata

这将打印shell上所有已注册用户的列表，但是我如何才能使其成为这样：如果用户想要重新登录，比如在列表上以“Michael”的名称登录，然后检索该用户的银行余额？你知道吗

balance_user = 500
f1 =open('N:\userFile', 'r')
filedata = f1.read()
f1.close()

print filedata
print "Welcome to the Banking Bank PLC public ATM service"
print "If you do have an account allready, select your name from the list of registered users."
user = raw_input("Please enter your ATM account name and insert your Banking Card. If you do not have an ATM account, please insert your Banking Card and enter New_User.")
if user == "New_User":
    print "Weclome to the Banking Bank PLC ATM service."
    user = raw_input ("Please enter an ATM account name that you wish to use to log onto the Banking Bank ATMs")

    f1 =open('N:\userFile', 'a+')
    print >> f1,user


print "Welcome", user, "to the Banking Bank PLC ATM service."
print "You have been given £100 for signing up. Please log out and back on to bank."

Answer 1

文件数据变量中的名称似乎用新行分隔，因此可以用'\n'字符将其拆分并放入列表中。你知道吗

从那里你可以检查用户输入的名字是否在列表中。你知道吗

name_list = filedata.split('\n')

if user in name_list:
    #your login code

Answer 2

读取文件的一种更为python的方法是使用with作用域并使用readlines（）方法：

path = 'N:\users_file'
username = 'some_username'

# Open the file
with open(path, 'r') as file:
    # Iterate over the lines in the file
    for user in file.readlines():
        if user == username:
            # Do something