Question

这是我的代码：

class BankAccount:
    def __init__(self, FirstName, LastName, AccNum, Balance, CreationYear, CreationMonth, CreationDay):
        self.FirstName = FirstName
        self.LirstName = LirstName
        self.AccNum = AccNum
        self.Balance = Balance
        self.CreationYear = CreationYear
        self.CreationMonth = CreationMonth
        self.CreationDay = CreationDay

    def AddAccount(self):
        self.FirstName = input("First Name: ")
        self.LastName = input("Last Name: ")
        self.AccNum = input("Account Number: ")
        self.Balance = input("Balance: ")
        self.CreationYear = input("Creatin Year: ")
        self.CreationMonth = input("Creation Month: ")
        self.CreationDay = input("Creation Day: ")
        return self.FirstName , self.LastName , self.AccNum , self.Balance , self.CreationYear , self.CreationMonth , self. CreationDay


    def Deposit(self):
        amount = input("How much do you want to Deposit? ")
        self.Balance = str(float(amount) + float(self.Balance))
        print("Balance: ", self.Balance)
        return self.Balance

    def Withdrawl(self):
        amount = input("How much do you want to withdrawl? ")
        if (float(amount) > float(self.Balance)):
            print("Insufficent Balance.")
        else:
            self.Balance = str(float(self.Balance) - float(amount))
            print("Balance: ", self.Balance)
        return self.Balance


x = BankAccount(FirstName, LastName, AccNum, Balance, CreationYear, CreationMonth, CreationDay)
x.AddAccount()

这是我遇到的错误

Traceback (most recent call last):
  File "C:\Users\Dark\Desktop\New folder (5)\bank.py", line 38, in <module>
    x = BankAccount(FirstName, LastName, AccNum, Balance, CreationYear, CreationMonth, CreationDay)
NameError: name 'FirstName' is not defined

Answer 1

类BankAccount不应用于收集用于创建它的用户数据；您可能应该从类中提取AddAccount，并使用它作为工厂函数来构建类：

也许是这样的：

class BankAccount:
    def __init__(self, FirstName, LastName, AccNum, Balance, CreationYear, CreationMonth, CreationDay):
        self.FirstName = FirstName
        self.LastName = LastName
        self.AccNum = AccNum
        self.Balance = Balance
        self.CreationYear = CreationYear
        self.CreationMonth = CreationMonth
        self.CreationDay = CreationDay

    def Deposit(self):
        amount = input("How much do you want to Deposit? ")
        self.Balance = str(float(amount) + float(self.Balance))
        print("Balance: ", self.Balance)
        return self.Balance

    def Withdrawl(self):
        amount = input("How much do you want to withdrawl? ")
        if (float(amount) > float(self.Balance)):
            print("Insufficent Balance.")
        else:
            self.Balance = str(float(self.Balance) - float(amount))
            print("Balance: ", self.Balance)
        return self.Balance


def AddAccount():
    """asks input data for the creation of a bank account,
    returns the newly created bank account
    """ 
    FirstName = input("First Name: ")
    LastName = input("Last Name: ")
    AccNum = input("Account Number: ")
    Balance = input("Balance: ")
    CreationYear = input("Creatin Year: ")
    CreationMonth = input("Creation Month: ")
    CreationDay = input("Creation Day: ")
    return BankAccount(FirstName , LastName , AccNum , Balance , CreationYear , CreationMonth , CreationDay)


x = AddAccount()

或者，您可以将属性初始化为None或zero，并让类请求用户输入。但是，使用class BankAccount处理用户输入可能不是最好的设计...

class BankAccount:
    def __init__(self):
        self.FirstName = None
        self.LastName = None
        self.AccNum = None
        self.Balance = 0
        self.CreationYear = None
        self.CreationMonth = None
        self.CreationDay = None

    def AddAccount(self):
        self.FirstName = input("First Name: ")
        self.LastName = input("Last Name: ")
        self.AccNum = input("Account Number: ")
        self.Balance = input("Balance: ")
        self.CreationYear = input("Creatin Year: ")
        self.CreationMonth = input("Creation Month: ")
        self.CreationDay = input("Creation Day: ")

    def Deposit(self):
        amount = input("How much do you want to Deposit? ")
        self.Balance = str(float(amount) + float(self.Balance))
        print("Balance: ", self.Balance)
        return self.Balance

    def Withdrawl(self):
        amount = input("How much do you want to withdrawl? ")
        if (float(amount) > float(self.Balance)):
            print("Insufficent Balance.")
        else:
            self.Balance = str(float(self.Balance) - float(amount))
            print("Balance: ", self.Balance)
        return self.Balance


x = BankAccount()
x.AddAccount()

Answer 2

您忘记定义传递给类构造函数的变量。

您可能要使用3个选项之一：

1）在使用变量之前先定义变量，例如

FirstName = "Jhon"
LastName = "Doe"
... #define rest of variables
x = BankAccount(FirstName, LastName, AccNum, Balance, CreationYear, CreationMonth, CreationDay)

2）用文字来调用类构造函数，例如

x = BankAccount("Jhon", "Doe", "MyAccount", 200, 2019, 6, 2)

3）直接在__init__内部定义变量，例如

class BankAccount:
    def __init__(self):
        self.FirstName = input("First Name: ")
        self.LastName = input("Last Name: ")
        self.AccNum = input("Account Number: ")
        self.Balance = input("Balance: ")
        self.CreationYear = input("Creatin Year: ")
        self.CreationMonth = input("Creation Month: ")
        self.CreationDay = input("Creation Day: ")
    #rest of code

Python NameError：名称未在bankAccount示例中定义

2 个答案: