该程序用于检查用户名和密码以允许用户进入。但是，在我添加新用户的末尾，我希望该用户能够立即尝试导入其新创建的用户名和密码，以便他们将用户名和密码添加到数据库后，无需重新运行即可进入该程序。但是，此代码返回错误“列表索引超出范围”
filename1 =“ c：\ Users \ Anna Hamelin \ Documents \ Python Scripts \ SourceCode \ Project2 \ usernames.txt” file = open（filename1，“ r”）
#Usernames
users = file.read()
usernameslist = [line.strip() for line in open("c:\\Users\\Anna Hamelin\\Documents\\Python Scripts\\SourceCode\\Project2\\usernames.txt")]
#print(users) #Check file
#print(usernameslist) #Check usernames list
file.close()
filename2 = "c:\\Users\\Anna Hamelin\\Documents\\Python Scripts\\SourceCode\\Project2\\passwords.txt"
file = open(filename2, "r")
#Passwords
passwords = file.read()
passwordslist = [line.strip() for line in open("c:\\Users\\Anna Hamelin\\Documents\\Python Scripts\\SourceCode\\Project2\\passwords.txt")]
#print(passwords) #Check file
#print(passwordslist) #Check passwords list
file.close()
#Compile the usernames and passwords lists for easy checking
#compiled_list = list(zip(usernameslist,passwordslist))
#print(compiled_list)
#Scores
filename3 = "c:\\Users\\Anna Hamelin\\Documents\\Python Scripts\\SourceCode\\Project2\\scores.txt"
file = open(filename3, "r")
scores = file.read()
scoreslist = [line.strip() for line in open("c:\\Users\\Anna Hamelin\\Documents\\Python Scripts\\SourceCode\\Project2\\scores.txt")]
#print(scores) #Check file
#print(scoreslist) #Check scores
file.close()
#STAGE 2
#Print Welcome/Intro message
response = input("-"*50 + "\nWelcome! Do you have an account (y/n)? ")
print("-"*50)
#If user has an account:
if response == "y":
#Create a login function:
#def login():
goodlogin = False
username = input("Please enter your username: ")
password = input("Please enter your password: ")
for id in range(len(usernameslist)):
if username == usernameslist[id] and password == passwordslist[id]:
goodlogin = True
if goodlogin:
print(print_in_green + "Access granted!" + print_default)
else:
print(print_in_red + "Incorrect Login credentials, please try again." + print_default)
#login()
#If user does not have account:
else:
newusername = input("What is your new username? ")
newpassowrd = input("What is your new password? ")
file = open(filename1, "a")
file.write("\n" + newusername)
file = open(filename2, "a")
file.write("\n" + newpassowrd)
file.close
print("Now that you have created an account, please continue.")
goodlogin = False
username = input("Please enter your username: ")
password = input("Please enter your password: ")
for id in range(len(usernameslist)):
if username == usernameslist[id] and password == passwordslist[id]:
goodlogin = True
if goodlogin:
print(print_in_green + "Access granted!" + print_default)
else:
print(print_in_red + "Incorrect Login credentials, please try again." + print_default)
答案 0 :(得分：0)
您可以将该交互逻辑抽象为一个循环。您也可以使用with选项打开/关闭文件来删除一堆代码。这是一个用于更新用户和密码的原型。
您的身份验证是....不安全，哈哈，因为多个用户可以使用相同的密码等。我会根据用户和密码的组合创建一个哈希，但这就是一个不同的故事:)
def interact(user_names_ls, passwords_ls):
goodlogin = False
username = raw_input("Please enter your username: ")
password = raw_input("Please enter your password: ")
if username in user_names_ls and password in passwords_ls:
goodlogin = True
if goodlogin:
print( "Access granted!")
else:
print("Incorrect Login credentials, please try again.")
interact(user_names_ls, passwords_ls)
usernames_file_path = "usernames.txt"
with open(usernames_file_path, "r") as f:
user_names_ls = f.readlines()
user_names_ls = [user.rstrip() for user in user_names_ls]
passwords_file_path = "passwords.txt"
with open(passwords_file_path, "r") as f:
passwords_ls = f.readlines()
passwords_ls = [password.rstrip() for password in passwords_ls]
print("-"*50)
end_interaction = False
while not end_interaction:
response = raw_input("-" * 50 + "\nWelcome! Do you have an account (y/n) [q to quit]? ")
if response == "q":
end_interaction = True
#If user has an account:
if response == "y":
interact(user_names_ls, passwords_ls)
#If user does not have account:
else:
newusername = raw_input("What is your new username? ")
newpassowrd = raw_input("What is your new password? ")
# here's where we can update our user and password cache
user_names_ls.append(newusername)
passwords_ls.append(newpassowrd)
# officially update the 'databases'
with open(usernames_file_path, "w") as f:
user_names_ls = f.writelines(user_names_ls)
with open(usernames_file_path, "w") as f:
passwords_ls = f.writelines(passwords_ls)
示例互动：
Welcome! Do you have an account (y/n) [q to quit]? n
What is your new username? he
What is your new password? 99
--------------------------------------------------
Welcome! Do you have an account (y/n) [q to quit]? y
Please enter your username: he
Please enter your password: 99
Access granted!
--------------------------------------------------
Welcome! Do you have an account (y/n) [q to quit]?
btw-我在这里使用了raw_input，但是您可以将其与输入交换
答案 1 :(得分：0)
我添加了几个函数来减少代码重用。另外，我在login_user函数中加载了用户名和密码，以便它始终获取最新副本。
Query