How do I code this python inputs conditions?

Build a function named “multiply” that accepts two user “inputs” when run.

As a user, when I run your function, I should be asked to input the first value I want to multiply, and then the second value.

If any of my inputs are non-numbers (i.e: inputs should be either floats or integers), then the function should return “Error: invalid argument!”

Else, the function should return the product of the two inputs.

def multiply ():
     num1 = (input('Multiply '))
     num2 = (input ('by '))
if num1 == int:
    return "error: invalid error"
else:
    print ("int()")
else:
    num1 = float(input('Multiply '))
    num2 = float(input('by '))
    product = (num1*num2)
    return product