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

A programmer usually prefer the predefined functions and variables for document,<br /> Modules are collection of several diffrent definitions(functions and variables)<br /> and statements.Or to put simply The files with “.py” appended at the name of the<br /> source code,the user can import that module(files) or specific function fromthat<br /> module into the file.<br /> programmer use the module,complete project in less time and more efficient way.<br /> programmer generally import either the module which user saved with “.py” or can<br /> use some standard module like random,queue,array,math,profile,statistics etc….<br /> just type “help(‘modules’)” and you can see all standard modules in interactive<br /> mode.<br /> ——————————————————————————-<br /> Eg–> # here entire math universe will come into the program<br /> >>> import math<br /> >>> math.cos(60)# math.cos()<br /> -0.9524129804151563<br /> >>> math.ceil(6.12)#math.ceil()<br /> 7<br /> >>> math.log2(4)#math.log2()<br /> 2.0<br /> ——————————————————————————-<br /> #but if you want specific built in function then use “from”.<br /> Eg–> # only perticular function will come from the math module.<br /> >>> from math import sqrt,sin<br /> >>> sqrt(9)#math module will be undefine since only function sqrt,sin defined<br /> 3.0<br /> >>> sin(60)# sin is imported from math and “math.” is not required<br /> -0.3048106211022167<br /> >>> cos(60)# cos is not part of the built in function that imported from math.<br /> ”’Traceback (most recent call last):<br /> File “<pyshell#3>”, line 1, in <module><br /> cos(60)<br /> NameError: name ‘cos’ is not defined”’<br /> >>> math.cos(60)# this gives error because math has not been imported<br /> ”’Traceback (most recent call last):<br /> File “<pyshell#4>”, line 1, in <module><br /> math.cos(60)<br /> NameError: name ‘math’ is not defined”’<br /> ——————————————————————————-<br />

import numpy as np:

import pyttsx3 # using ptython to convert text to speech

import pandas as pd:

# Python program to illustrate<br /> # math module<br /> import math<br />   <br /> def Main():<br />     num = -85<br />   <br />     # fabs is used to get the absolute <br />     # value of a decimal<br />     num = math.fabs(num) <br />     print(num)<br />       <br />       <br /> if __name__==”__main__”:<br />     Main()

from numpy import exp, array, random, dot<br /> training_set_inputs = array([[0, 0, 1], [1, 1, 1], [1, 0, 1], [0, 1, 1]])<br /> training_set_outputs = array([[0, 1, 1, 0]]).T<br /> random.seed(1)<br /> synaptic_weights = 2 * random.random((3, 1)) – 1<br /> for iteration in xrange(10000):<br /> output = 1 / (1 + exp(-(dot(training_set_inputs, synaptic_weights))))<br /> synaptic_weights += dot(training_set_inputs.T, (training_set_outputs – output) * output * (1 – output))<br /> print 1 / (1 + exp(-(dot(array([1, 0, 0]), synaptic_weights))))<br />

”’<br /> Please note that there are many more that I may not have listed<br /> There are also other reasons for using these modules other than the<br /> reasons that I have listed.<br /> ”’</p> <p>import random # Mainly used for random number<br /> import time # Mainly used for time.sleep()<br /> import math # More complex maths<br /> import os # Working with files?<br /> import pygame # Creating windows (games)<br /> import turtle # Creating windows<br /> import re # Regex<br /> import numpy # Dealing with arrays<br /> import socket # Netorking, communicating between computers<br /> import this # Poem<br /> import keyboard # Receiving keyboard inputs<br /> import mouse # Detecting mouse clicks<br /> import webbrowser # Opening websites<br /> import pprint # Formating text<br /> import pyautogui # Automation</p> <p># Might add more