what is the use of modules in python code example

Example 1: modules in python

#use import statement to import modules
import random
r = random.randint(1,10)
#use from-import statements to import functions
from random import randint
r = randint(1,10)
#use from module import * statement to import all functions
from random import *
r = randint(1,10)

Example 2: modules in python

import  pandas as pd: