Python How to's

Question 1

How to take input from user ?

Answer 1

We have to use input function.

variable = input(“Enter Value >”)

Question 2

How to take arguments from terminal ?

Answer 2

1. Import optparse module
2. Create optparse object.
3. Teach optparse object for arguments.
4. Capture arguments in variable using optparse.
   import optparse
   parser = optparse.OptionParser()
   parser.add_option(“-i”, “–interface”, dest = “interface”, help = “Network Interface “)
   (interface, arguments) = parser.parse_args()
   subprocess.call(“ifconfig”, interface.interface)

Question 3

How to Execute Linux System Command ?

Answer 3

1. import subprocess module
2. execute system command with subrocess functions
   import subprocess
   subprocess.call(“ifconfig”,”eth0”)

Question 4

How to handel regular expressions ?

Answer 4

1. import re module
2. execute re functions to search
   import re
   re.search(r’regular expression’,stringVariable,flag)

Question 5

How many ways to present list with index value?

Answer 5

By Three Ways we can achieve this.

                 1. Using enumerate function
                  2. Using Zi[p Function
                    3. Usinge range function

For Code See Juypter Lab - Python Exercise for Practice

Question 6

How to use subprocess Module.

Answer 6

import subprocess

subprocess.call(“ifconfig”,interface,”hw”,”ether”)

Question 7

How to capture output of subprocess.

Answer 7

ifconfig_output = subprocess.check_output(“ifconfig”, interface,)

Question 8

How many types to use subprocess module.

Answer 8

subprocess. call(“ifconfig eth0 down “,shell=True)
subprocess. call(“ifconfig “+ interface + “ down”,shell=True)
subprocess. call(“ifconfig”,”eth0”)
subprocess. call(“ifconfig”, interface)

Question 9

Which Function is used with subprocess to execute system command.

Answer 9

subprocess.call()

Question 10

Which Function is used with subprocess to read output of system command.

Answer 10

subprocess.check_output

Question 11

Which class is used to create optparse object?

Answer 11

optparse.OptionParser()

Question 12

Which function is used with optparse object to teach object ?

Answer 12

parser.add_options(“-i”, “–interface”, dest = “interface”,help=”Ethernet Interface”)

Question 13

Which function is used with optparse object to process arguments ?

Answer 13

parser.parse_args()

interface,arguments)=parse.parse_args(

Question 14

Which function is used with optparse object to handle error ?

Answer 14

parser.error()

Question 15

Which function is used with optparse object to get arguments ?

Answer 15

parser.parse_args()

Question 16

How to handel error in optparse ?

Answer 16

if not interface:

parser.error(“[-] Plz Specify interface or –help for more info”)

Question 17

How to generate number by random module

Answer 17

import random

number = random.randint(startRange,endRange)

Question 18

How to get a square root of a number

Answer 18

import math

sqrt = math.sqrt(number)

Question 19

How to get present working directory

Answer 19

os module

print(os.getcwd())

Question 20

How to import how to import PDF file

Answer 20

PyPDF2