需要好好解释一下这个小 python 代码

Question

I am actually following python on solo learn and came across this little code. Need a good explanation of this one. Thank you.

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))

Answer 1

do_twice get a function and two parameters.

then return below result:

func(func(param), func(param))

In this specific example:

add(add(5,10), add(5,10)) = add(15, 15) = 30

Answer 2

do_twice(add, a, b))

add(add(x, y), add(x, y))

this function will return (x+y)*2

param 1 (func) => add(num1, num2)
param 2 (x) => a number
param 3 (y) => another number

num1 will be x+y

num2 will be x+y

so the value of do_twice will be ((x+y)+(x+y)).

I'm improving my English, be patient. I hope that explanation help's you