Question

因此，我尝试使用Python3在终端中编写登录对话，但出于某些原因，此代码：

def start():

    login_signin_Confirmation = input("Welcome! Do you wish to log-in to your account or sign up to this platform? \n")

    if login_signin_Confirmation == "login":
        
        login()
    else:
        signup()       
start()

def login():

    login_username = input("Great! start by typing in your username.")

    if login_username in users:
        print("Welcome Back, {login_username}")
login()

提示我此错误消息：

Welcome! Do you wish to log-in to your account or sign up to this platform? 
login
Traceback (most recent call last):
  File "login.py", line 22, in <module>
    start()
  File "login.py", line 19, in start
    login()
NameError: name 'login' is not defined

刚开始时，我不太确定自己做错了什么，也找不到同样问题的人...

Answer 1

正如其他人指出的那样，您需要先定义，然后再调用一个函数：

# imports first

# now definitions of functions

def start():
    login_signin_Confirmation = input("Welcome! Do you wish to log-in to your account or sign up to this platform? \n")
    if login_signin_Confirmation == "login":
        login()
    else:
        signup()       

def signup():
    pass

def login():
    login_username = input("Great! start by typing in your username.")
    if login_username in users:
        print("Welcome Back, {login_username}")


# main 
def main():
    start()

# guard multiprocess context
if __name__ == '__main__':
    main()

在if语句中调用函数-Python3

1 个答案: