Python课程整理

Question

我的课程作业需要一两件事的帮助。首先，当我输入错误的用户名/密码时，它会一次输出多条错误消息。其次，当men函数结束时，程序将返回到登录循环（允许用户重新输入他们的用户名/密码），我已经通过使用B变量修复了这个但是这感觉非常笨拙而且我知道有这样做的更好方法。非常感谢任何修改或提示（即使它们与我的上述问题无关）。我编码的方式也有点奇怪，所以从下到上阅读它是最好的。）

def quiz():
print ("quiz")# place holder for real code (let's me know the function has been run)
def report():
print ("report") # place holder for real code (let's me know the function has been run)
def a_menu():# Admin menu
print ("Welcome to the student quiz!")
print ("Please choose a option")
while True:
    print ("1: Computer science")
    print ("2: Histroy")
    print ("3: Reports")
    menu_in = int(input())
    if menu_in == 1:
        Comp_sci = True
        quiz()
        break
    elif menu_in == 2:
        Hist = True
        quiz()
        break
    elif menu_in == 3:
        report()
        break
    else:
        print ("Invalid input! Please try again..")
     def menu():
    print ("Welcome to the student quiz!")
    print ("Please choose a quiz")
    while True:

        print ("1: Computer science")
        print ("2: Histroy")
        menu_in = int(input())
        if menu_in == 1:
            Comp_sci = True
            quiz()
            break
        elif menu_in == 2:
            Hist = True
            quiz()
            break
def login():
b = False
print ("Please enter your username and password")
while True:
    if b == True:
        break
    log_user = input("Username:")
    log_pass = input ("Password:")
    with open("D:\\Computer science\\Computing test\\logindata.txt","r") as log_read:
        num_lines = sum(1 for line in open('D:\\Computer science\\Computing test\\logindata.txt'))
        num_lines = num_lines-1
        for line in log_read:
            log_line = log_read.readline()
            log_splt = log_line.split(",")
            if log_user == log_splt[0] and log_pass == log_splt[2]:
                if log_splt[5] == "a": # Admin will have to mannually change the admin status of other user's through .txt file.
                    b = True
                    a_menu()
                else:
                    b = True
                    log_read.close()
                    menu()
                    break
            else:
                print ("Incorrect username or password, please try again!")
def register():
print ("enter your name, age, and year group and password")
while True:
    reg_name = input("Name:")
    reg_pass = input ("Password:")
    reg_age = input ("age:")
    reg_group = input ("Year Group:")
    print ("Is this infomation correct?")
    print ("Name:",reg_name)
    print ("password:",reg_pass)
    print ("Age:",reg_age)
    print ("Year Group:", reg_group)
    reg_correct = input ("[Y/N]").lower()
    if reg_correct == "y":
        reg_user = reg_name[0:3]+reg_age
        reg_write = open("D:\\Computer science\\Computing test\\logindata.txt","a")
        reg_write.write (reg_user+","+reg_name+","+reg_pass+","+reg_age+","+reg_group+","+"u"+"\n")
        print ("Your username is:",reg_user)
        reg_write.close()
        login()
        break
    elif reg_correct == "n":
        print ("Please Re-enter your infomation")
    else:
        Print ("Invalid input! Please try again...!")
def login_ask():
print ("Do you already have an account?")
while True:
    ask_in = input("[Y/N]").lower()
    if ask_in == "y":
        login()
        break
    elif ask_in == "n":
        register()
        break
  login_ask()