Python：银行ATM程序

Question

在Python程序中，我创建了一个类userdetails-（尽管我还有一些其他类要在后面添加）。我已经从该类创建了2个对象，但我不能调用所有对象？这是我的问题。我想将单独的pin_no链接到单独的对象，并单独调用它们的详细信息

from Details import userdetails


pin_no = (1111, 2222)

while True:

    pin_no = input("Input the no : ")

    if pin_no == '1111' or pin_no == '2222':
        
        
        print ("\n Hello and welcome to my program.  Please choose from one of the following options:")
        
        break
    
    else:
    
        print ("please try again ")
            
            
            
newuserdetails = userdetails ('Tom', '23 Bishop St ', 'cv3_f45', 2347477472)

newuserdetails1 = userdetails ('Bill', '81 Oliver St ', 'CV6 7FR', 574747477)   
  
  
user =  input("\n\n 1. Userdetails \n 2. Address \n 3. Post Code \n 4. Tel No " '\n')

a = '1'
b = '2'
c = '3'
d = '4'


if user == a:

    print (newuserdetails.name) or (newuserdetails1.name) 
    
elif user == b:
    
    print (newuserdetails.address)
     
elif user == c:
    
    print (newuserdetails.post_code)
    
elif user == d:
    
    print (newuserdetails.tel_no)

Answer 1

我相信你要找的是一本字典

newuserdetails = userdetails ('Tom', '23 Bishop St ', 'cv3_f45', 2347477472)
newuserdetails1 = userdetails ('Bill', '81 Oliver St ', 'CV6 7FR', 574747477)
newuserdetails2 = userdetails ('John', '35 Main St ', 'CRF 250R', 435247477)


# create the dictionary right after you create the class, so they can be in the same scope
# whenever you would reference newuserdetails, you can now reference the dictionary object

dict = { # if you know all the users when you create the dictionary
  '1111': newuserdetails,
  '2222': newuserdetails1,
}

# to add a user after the dictionary has been created
dict['3333'] = newuserdetails2

然后，您可以使用以下方法通过pin获取用户详细信息实例：

dict['1111'] # returns newuserdetails

# instead of using:
newuserdetails.name # returns 'Tom'

# you can now use:
dict['1111'].name # returns 'Tom'

# Or you could assign it to a temp variable if that makes more sense
currentuserdetails = dict['1111']
currentuserdetails.name # still returns 'Tom'

但是，我警告不要使用pin作为获取用户身份的方式

如果两个用户碰巧选择了相同的pin码，那么就会出现错误，您的代码也会中断。 您更适合使用ID来获取用户详细信息

编辑：

下面是我正在使用的，它在Python3.8上的工作与预期的一样

class userdetails:
    def __init__(self, name, addr, num, number):
        self.name = name
        self.address = addr
        self.post_code = num
        self.tel_no = number


pin_no = (1111, 2222)

while True:
    pin_no = input("Input the no : ")
    if pin_no == '1111' or pin_no == '2222':
        print ("\n Hello and welcome to my program.  Please choose from one of the following options:")     
        break
    
    else:
        print ("please try again ")
            
               
newuserdetails = userdetails ('Tom', '23 Bishop St ', 'cv3_f45', 2347477472)
newuserdetails1 = userdetails ('Bill', '81 Oliver St ', 'CV6 7FR', 574747477)   
dict = {
  '1111': newuserdetails,
  '2222': newuserdetails1
}

user =  input("\n\n 1. Userdetails \n 2. Address \n 3. Post Code \n 4. Tel No " '\n')

a = '1'
b = '2'
c = '3'
d = '4'


if user == a:
    print (dict[pin_no].name)
elif user == b:
    print (dict[pin_no].address)
elif user == c:
    print (dict[pin_no].post_code)
elif user == d:
    print (dict[pin_no].tel_no)