calculator in python

 print("do not use this for cheating")

#this will add your numbers
def addition(a,b):
    return a+b
#this will subtract
def subtract(a,b):
    return a-b
#this will multiply
def multiply(a,b):
    return a*b
#this will devide
def devide(a,b):
    return a/b

print("Select operation.")
print("1.Add")
print("2.Subtract")
print("3.Multiply")
print("4.Divide")
while True :
    choice = input("Enter choice(1/2/3/4): ")
    if choice in ('1', '2', '3', '4'):
        num1 = float(input("enter first number"))
        num2 = float(input("enter second number"))

        if choice == '1':
            print(num1, "+", num2, "=", addition(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, "=", devide(num1, num2))
            break
        else:
            print("invalid input")