IndentationError：预期缩进的块（python codeacademy）

Question

I was taking my course at codeacademy until something went wrong and couldn't proceed, a little help please :( here is my code

def by_three(num):         
    if num%3 == 0:
        def cube(num):        
    else:        
        print "False"

def cube(num):  
    return num**3

by_three(9)

I get...

File "<stdin>", line 4  
else:  
^  
IndentationError: expected an indented block  
Unknown error.

I will really appreciate your help people!!

Answer 1

You probably wanted to call (use) the function cube() instead of defining it
(in your by_three() function definition), so your corrected code will be:

def by_three(num):         
    if num%3 == 0:
        print cube(num)          # Instead of your original "def cube(num):"       
    else:        
        print "False"

def cube(num):  
    return num**3

by_three(9)

Answer 2

On line 3 def cube(num): you have an extra def and : . Remove those

When defining a function you need def and colon, where as for calling it you don't need one. The correct code

def by_three(num):    
    if num%3 == 0:
        cube(num)
    else:    
        print "False"

def cube(num):  
    return num**3

by_three(9)