create a calculator in python

main.py
# define functions for each operation
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

# take input from the user
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: "))

# perform calculation based on user's choice
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. Please try again.")
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