Syntax error and im a beginner

[C0D3DSK1llS]

###NOT SURE WHAT IM DOING WRONG.
==========================================================

print("Select operation.")
print("1.Add")
print("2.Subtract")
print("3.Multiply")
print("4.Divide")
while True:
    # take input from the user
    choice = input("Enter choice(1/2/3/4): ")

    # check if choice is one of the four options
    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, "=", 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))
      
        # check if user wants another calculation
        # break the while loop if answer is no
        next_calculation = input("Let's do next calculation? (yes/no): ")
        if next_calculation == "no":
          break
  
    else:
        print("Invalid Input")

I keep getting this syntax error
Traceback (most recent call last):
File "/home/anonymous/Desktop/print.py", line 22, in <module>
print(num1, "*", num2, "=", multiply(num1, num2))
NameError: name 'multiply' is not defined

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[phillip1882]

your getting that error because python doesn't have a default multiply function. you'll need to write it.