有人能解释一下为什么我的自动柜员机python程序出现这个错误(TypeError：-不支持的操作数类型：'float‘和'tuple')

Question

我已经测试了所有的代码，但每当我尝试使用传输命令时，我都会得到这个错误。有人能告诉我如何修复它吗，我对所有这些都很陌生。

这是错误code-error的图像

我也收到了这个错误

出现异常: TypeError不支持-的操作数类型：'float‘和'tuple’行30，在转帐balance=(余额，金额)+余额行58，在转帐(余额，金额)

name=input("write  your name? ")
balance=float(input("Your current balance? "))

def printMenu():
    print(name,"Welcome to the atm")
    print(""""Pick from the following
          'b'(balance)
          'd'(deposit)
          'w'(withdraw)
          't'(transfer)
          'q'(quit)""")

def getTransaction():
    transaction=str(input("What would you like to do? "))
    return transaction

def withdraw(bal,amt):
    global balance
    balance=bal-amt
    if balance<0:
        balance=balance-10


def formatCurrency(amt):
    return "SR%.2f" %amt


def transfer (bal,amt):
    global balance
    balance=(bal-amt) + balance
    if balance<0:
        print("You dont have enoung funds for that: ")


printMenu()
command=str(getTransaction())

while command!="q":
    if (command=="b"):
        print(name,"Your current balance is",formatCurrency(balance))
        printMenu()
        command=str(getTransaction())
    elif (command=="d"):
        amount=float(input("Amount to deposit? "))
        balance=balance+amount
        printMenu()
        command=str(getTransaction())
    elif (command=="w"):
        amount=float(input("Amount to withdraw? "))
        withdraw(balance,amount)
        printMenu()
        command=str(getTransaction())
    elif (command=="t"):
        Name =print("who would you like to transfer money too")
        print (input("write here: "))
        amount = print, float(input("write here the amount that you will send: "))
        print("You will send {amount}to {Name}")
        transfer(balance,amount)
        command=str(getTransaction())
    else:
        print("Incorrect command. Please try again.")
        printMenu()
        command=str(getTransaction())

print(name,"Thank you for using this atm! See you again soon")

Answer 1

amount = print, float(input("write here the amount that you will send: "))

这一错误行使amount成为一个元组，因此在调用transfer(balance, amount)时出现错误。

不知道您试图在这里实现什么，但它绝对应该更改为

amount = float(input("write here the amount that you will send: "))