看看我對您的代碼所做的更改，如下所示：

def add (x, y):

return(x + y)

def subtract(x, y):

return(x - y)

def multiply(x, y):

return(x * y)

def divide(x, y):

return(x / y)

def input_number(prompt):

while True:

try:

return int(input(prompt))

except ValueError:

print("That was not a number")

# Keep going around the loop until the user chooses 5 to quit

while True:

print

print("Select operation.")

print("1.Add")

print("2.Subtract")

print("3.Multiply")

print("4.Divide")

print("5.Quit")

choice = input("Enter choice(1/2/3/4/5):")

# Do they want to quit?

if choice == 5:

break

num1 = input_number("Enter first number: ")

num2 = input_number("Enter second number: ")

if choice == 1:

print(num1,"+",num2,"=", add(num1,num2))

elif choice == 2:

print(num1,"-",num2,"=", subtract(num1,num2))

elif choice == 3:

print(num1,"*",num2,"=", multiply(num1,num2))

elif choice == 4:

print(num1,"/",num2,"=", divide(num1,num2))

else:

print("%s - Invalid input" % choice)

為了要求更多輸入，您需要將提示包裝在一個循環中 . 然后，您需要向用戶添加一個選項以允許它們退出 .

此外，您可以將數字提示移動到一個功能 . 如果用戶輸入字符，這將繼續詢問號碼 .

總結

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