I am writing a program with python which will do several things such as login as student, login as driver. but when I try to run the code, I face several problems. I am writting down the code below. and also I am giving you the screenshot of the errors. Please help if you can.
我正在用python编写一个程序，它将执行一些操作，例如登录为学生，登录为驱动程序。但是当我尝试运行代码时，我遇到了几个问题。我正在写下面的代码。而且我也给你错误的截图。如果可以的话请帮忙。
Thanks in advance.
提前致谢。
print "========================================================"
print "==============Welcome to LiftServer System=============="
print "========================================================"
print "\n"
print "Type start() to View the Options"
print "\n"
DriverLogin=[("ali", "ila"), ("bla", "alb")]
PassLogin=[("ila", "ali")]
def CorrectDriverLogin(n,x):
for i in range (len(x)):
a,b = x[i]
if (a==n):
return b
def CorrectPassLogIn(c,y):
for j in range (len(y)):
d,e = y[j]
if (d==c):
return e
def start():
print "\n"
print "=====================You are in the System============="
print "\n"
print "Choose an option:"
print "======================================================="
print "1. Login for Drivers"
print "2. Login for Students"
print "3. Exit"
print "======================================================="
print "\n"
choice= raw_input("Enter the choice number:")
print "\n"
if (int(choice)==1):
print""
DriverLogin()
elif(int(choice)==2):
print ""
PassLogin()
if (int(choice)==1):
print" "
print" "
p = raw_input (" Current campus: ")
k = raw_input (" Travelling to: ")
m = raw_input (" Leaving Time: ")
x = raw_input (" Enter AM / PM: ")
a = raw_input (" Number of available seats: ")
j = raw_input (" Meeting time: ")
print" \nI am in campus " + p + " ,leaving to campus " + k + " at: " + m + x +" ,where I have only " + a + " seat(s) available."
print" "
print"I will be at the reception at: " + j + x + "."
print" "
print"===================================================="
print"\n"
print "Send message? "
print" "
sendTheMessageD()
elif (int(choice)==2):
homePage()
def sendTheMessageD():
print" "
print"1. Yes"
print"2. No"
choice = raw_input ("Confirm: ")
print" "
homePage()
def PassLogin():
userPass = raw_input("Username:")
passName = raw_input("Password:")
choice=0
if (userPass==CorrectPassLogIn(passName, PassLogin)):
print"\n"
print "=================================================================="
print "1. Send a Message"
print "2. View Messages"
print "3. Log out of the System"
print "==================================================================="
print "\n"
choice = raw_input("Enter the choice's number:")
print"\n"
else:
print"Incorrect Username or Password"
print"\n"
print"Try To Log In Again"
if (int(choice)==1):
print" "
sendMessageP()
elif(int(choice)==2):
print" "
viewMessageD()
def sendMessageP():
print "======================================================================="
print "1)Write a message"
print "2)Go Back"
print "===========++=========================================================="
print" "
choice = raw_input("Enter The choice's Number: ")
if(int(choice)==1):
print" "
y = raw_input("Destination: ")
c = raw_input("Time: ")
l = raw_input("Enter AM ? PM: ")
t = raw_input("Required seats: ")
print"\n Is there anyone going to campus " + y + " ,at: " + c + l + " ,and has " + t + " seat(s) available."
elif(int(choice)==2):
print""
def sendTheMessageP():
print" "
print"1)Yes"
print"2)No"
choice = raw_input ("confirm")
print" "
homePage()
def viewMessageD():
print "======================================================================="
print"Inbox"
print" "
print"1. Message 1"
print"2. Message 2"
print "======================================================================="
choice = raw_input ("Enter the choice's Number:")
if(int(choice)==1):
print"\n Message 1 is viewed"
if(int(choice)==2):
print"\n Message 2 is viewed"
else:
print""
def DriverLogin():
xdriver = raw_input("Username:")
xpass = raw_input("Password:")
choice =0
if (xpass==CorrectDriverLogin(xdriver, DriverLogin)):
print"\n"
print "============= You are now Logged in as a Driver ================"
print"Choose an option:-"
print "======================================================================"
print "1. Send a Message"
print "2. View Messages"
print "3. Log out of the system"
print "======================================================================"
print "\n"
choice = raw_input("Enter the choice's Number:")
else:
print"\n"
print"Incorrect Username or Password"
print"\n"
print"You are logged out of the System Try To Log In Again Please"
if(int(choice)==1):
print" "
sendMessageD()
elif(int(choice)==2):
print" "
elif(int(choice)==3):
print" "
def homePage():
print"\n"
print "======================================================================="
print "1. Send a Message"
print "2. View Messages"
print "3. Log Out of the System"
print "======================================================================="
print "\n"
choice = raw_input("Enter the Choice's Number:")
def sendMessageD():
print "======================================================================="
print"1. Write your message"
print"2. Go Back"
print "======================================================================="
print" "
choice = raw_input("Enter The Choice's Number:")
And here is the error I am getting: 
这是我得到的错误：
3 个解决方案
#1
3
In this line:
在这一行：
if (xpass==CorrectDriverLogin(xdriver, DriverLogin)):
You pass DriverLogin to CorrectDriverLogin without calling it, meaning you're passing the function and not the list/string returned by the function. So when you try and call len on it, it fails.
您将DriverLogin传递给CorrectDriverLogin而不调用它，这意味着您传递的是函数，而不是函数返回的列表/字符串。因此，当您尝试在其上调用len时，它会失败。
This likely happened because you also had a list named DriverLogin earlier in the script:
这可能是因为您在脚本中之前还有一个名为DriverLogin的列表：
DriverLogin=[("ali", "ila"), ("bla", "alb")]
But you've now reassigned that name to be a function:
但是你现在已经将该名称重新分配为一个函数：
def DriverLogin():
xdriver = raw_input("Username:")
...
#2
2
You named two things DriverLogin:
你将DriverLogin命名为两件事：
DriverLogin=[("ali", "ila"), ("bla", "alb")]
...
def DriverLogin():
When you tried to use the list, you got the function instead:
当您尝试使用该列表时，您获得了该功能：
if (xpass==CorrectDriverLogin(xdriver, DriverLogin)):
Don't reuse names in the same namespace like that. Name your function and your list different things. Same with PassLogin.
不要在同一名称空间中重用名称。为您的功能和列表命名不同的东西。与PassLogin相同。
#3
2
Answer: You have the function name "DriverLogin" being passed into the "CorrectDriverLogin" function in the main body of the code.
答：您将函数名称“DriverLogin”传递到代码主体中的“CorrectDriverLogin”函数中。
:) This happens to all of us. I'm still learning, and no-one is more mighty than the next person (it's all show).
:)这发生在我们所有人身上。我还在学习，没有人比下一个人更强大（这都是表演）。
#1
3
In this line:
在这一行：
if (xpass==CorrectDriverLogin(xdriver, DriverLogin)):
You pass DriverLogin to CorrectDriverLogin without calling it, meaning you're passing the function and not the list/string returned by the function. So when you try and call len on it, it fails.
您将DriverLogin传递给CorrectDriverLogin而不调用它，这意味着您传递的是函数，而不是函数返回的列表/字符串。因此，当您尝试在其上调用len时，它会失败。
This likely happened because you also had a list named DriverLogin earlier in the script:
这可能是因为您在脚本中之前还有一个名为DriverLogin的列表：
DriverLogin=[("ali", "ila"), ("bla", "alb")]
But you've now reassigned that name to be a function:
但是你现在已经将该名称重新分配为一个函数：
def DriverLogin():
xdriver = raw_input("Username:")
...
#2
2
You named two things DriverLogin:
你将DriverLogin命名为两件事：
DriverLogin=[("ali", "ila"), ("bla", "alb")]
...
def DriverLogin():
When you tried to use the list, you got the function instead:
当您尝试使用该列表时，您获得了该功能：
if (xpass==CorrectDriverLogin(xdriver, DriverLogin)):
Don't reuse names in the same namespace like that. Name your function and your list different things. Same with PassLogin.
不要在同一名称空间中重用名称。为您的功能和列表命名不同的东西。与PassLogin相同。
#3
2
Answer: You have the function name "DriverLogin" being passed into the "CorrectDriverLogin" function in the main body of the code.
答：您将函数名称“DriverLogin”传递到代码主体中的“CorrectDriverLogin”函数中。
:) This happens to all of us. I'm still learning, and no-one is more mighty than the next person (it's all show).
:)这发生在我们所有人身上。我还在学习，没有人比下一个人更强大（这都是表演）。