BankSystem 和我想贷款，但它抛出一个 TypeError

Question

我试图从 BankSystem 贷款，但它抛出一个错误，并说列表 object 不可调用，我想要求用户输入 100 欧元到 300 欧元之间的价格，如果这个数字更高，那是不接受的，但如果该金额为 100 欧元和 300 欧元，则接受：

import datetime
class BankSystem:
    total_deposit = 0
    total_withdraw = 0
    def __init__(self,name,accountNumber,salary):
        self.name = name
        self.accountNumber = accountNumber
        self.salary = salary
        self.withdraw_history = []
        self.deposit_history = []
        self.take_loan = []
    def description(self):
        print("Name is: " , self.name)
        print("AccountNumber: " , self.accountNumber)
        print("Salary: " , self.salary)
    def deposit(self,deposit):
        self.salary = self.salary + deposit 
        self.deposit_history.append(deposit)
        self.total_deposit += 1
    def withdraw(self,withdraw):
        self.salary = self.salary - withdraw
        self.withdraw_history.append(deposit)
        self.total_withdraw += 1
    def transaction_history(self):
        print("You have withdraw", self.withdraw_history , "On date:" , datetime.datetime.now())
        print("You have deposit" , self.deposit_history , "On date:" , datetime.datetime.now())
    def take_loan(self):
        answer = int(input("Enter the amount of loan who would you like to take between - 100Euros and 300 Euros: "))
        if answer > 300:
            print("Choose between 100 - 300 Euros not more")
        else:
            print("You have taken out for loan" , answer)
            self.take_loan.append(answer)
            
        
bank = BankSystem("Bill" , 42919502 , 4000)
bank.take_loan()   

Answer 1

删除行self.take_loan = [] 。

您正在使用空列表 object 覆盖take_loan() function，然后尝试调用它。

Answer 2

 self.take_loan = []

那是在惹麻烦。 它将标识符take_loan设置为空白列表，并在def take_loan(): [...]之后执行。

因此，当您运行bank.take_loan()时，就像尝试调用空列表一样，它确实不是可调用的，如错误消息所示。