我是Python新手，我在下面编写了这段代码。它只是一个简单的登录代码，允许您注册或登录。
现在我可以登录了。如您所见，我将用户名和密码放在变量database。
在函数register()中，我尝试以（用户名，密码）的形式将newusername和newpassword添加到database列表，以便{{1看到它的功能。
login()可悲的是，import time
import sys
import getpass
database = [
("Test1", "123"),
("Test2", "000")
]
def login():
time.sleep(1)
print("Welcome. Please login.")
while True:
time.sleep(1)
username = input("Username: ")
password = getpass.getpass("Password: ")
time.sleep(1)
if (username, password) in database:
print("Welcome, " + username)
main()
else:
print("User not found. Try again.")
def logout():
time.sleep(1)
print("Logout?")
lgout = input(">>")
if lgout == ("yes") or lgout == ("Yes") or lgout == ("YES"):
time.sleep(1)
print("Logout successful")
main2()
elif lgout == ("no") or lgout == ("No") or lgout == ("NO"):
print("Logout unsuccessful")
main()
else:
print("Command not valid")
def main():
time.sleep(1)
print("Current commands: Logout")
while True:
command = input(">>")
if command == ("Logout"):
logout()
else:
print("Command not valid")
def main2():
time.sleep(1)
print("Hello, would you like to login, register or exit?")
while True:
command2 = input(">>")
if command2 == ("Login") or command2 == ("login") or command2 == ("LOGIN"):
login()
elif command2 == ("Register") or command2 == ("register") or command2 == ("REGISTER"):
register()
elif command2 == ("Exit") or command2 == ("exit") or command2 == ("EXIT"):
sys.exit()
else:
print("Command not valid")
def register():
print("Register your information below")
newusername = input("Username: ")
newpassword = getpass.getpass("Password: ")
print("Success! Please login!")
login()
main2()
不起作用，因为它不是字典。
答案 0 :(得分：1)
这里的“数据库”是一个元组列表。
要将某些内容附加到列表的末尾，请使用.append（）。要构造元组，请使用包含以逗号分隔的值的括号。将这两者放在一起：
database.append( (newusername, newpassword) )