"我不明白这段代码试图做什么？"

Question

I am new to python and my professor keeps posting this problem for the class to answer:

*x = 2 
 y = 3
 sum = add( x, y)
 print(sum)
 def add (num1 = 0, num2 = 0):
 total = num1 + num2
 return total**

Answer 1

As you correctly identified, this code is calling the function add before it's defined. Furthermore, the astrix in front of the first variable is out of place - that should make a list out of otherwise unassigned variables. The double astrix on the return line is also out of place.