Functions as objects

Question

Hey!

In the tutorial there is this example:
-----------------------------------------------------------------
def add(x, y):
return x + y

def do_twice(func, x, y):
return func(func(x, y), func(x, y))

a = 5
b = 10

print(do_twice(add, a, b))
--------------------------------------------------------------------
which returns 15+15=30, but if i manipulate to this:

---------------------------------------------------------------
def add(x, y):
return 2*x + y

def do_twice(func, x, y):
return func(func(x, y), func(x, y))

a = 3
b = 1000

print(do_twice(add, a, b))
--------------------------------------------------------------
it returns 3018 which is 3 * 1006, but why is it not 2012 ?

thanks a lot! :)

Answer 1

The do_twice(add,a,b) call will return the value returned by add(add(a,b),add(a,b)) (with parameters values transmitted)...

So, it return add(2*a+b,2*a+b) value, wich is:

2*(2*a+b)+(2*a+b)
== 2*(2*3+1000)+(2*3+1000)
== 2*(1006)+(1006)
== 2012+1006
== 3018

^^