小编AtP*_*hon的帖子

如何在python中int投射enum？

当用户输入字符串而不是整数时,我想保护我创建的python计算器不会崩溃.

当用户输入字符串而不是数字时,我尝试使用else语句打印"无效输入"(或其他我无法记住的内容).

我还想知道是否有办法让用户执行另一个操作而不必重新启动应用程序.

如果需要任何导入(如果可以),请列出它是否与cx_Freeze兼容.

源代码:

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)

print("Select operation.")
print("1.Add")
print("2.Subtract")
print("3.Multiply")
print("4.Divide")

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

num1 = int(input("Enter first number: "))
num2 = int(input("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("Invalid input")