파이썬 계산기 코드

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 = float(input("Enter first number: "))
num2 = float(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")