How to import standard library functions in Python

It's hard for me to work like this , I know it may be the problem of the folder , But what happened , Please teach me

from random import randint

Just imported random Module randint, If you import the whole random The module needs to be written as

import random

If you want to call random Module random function , Need to be written

from random import random

Or when calling a function, write

random.random()