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PUSAPATI SWETHA/assignment1- 07.04.2020.txt

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+Q1 how to change umask value permanently
+   write a new umask value in the shell configuration file(~/.bashrc for Bash) or in the /etc/profile file
+
+Q2 how to add new user without adduser or useradd
+   add the user in /etc/passwd file then add a group with the same name in /etc/group and then set passwd with passwd command
+
+Q3 can umask value be changed to 0888
+   it can not be changed to 0888 because the maximum value of a umask itself is 0777(r=4, w=2, x=1; 4+2+1=7)
+
+
+Q4 how to add new user with unique id & how to check that unique id
+   useradd -u 1345 username //creates a new user with our desired Unique id (given here 1345)
+   cat /etc/passwd | grep username // prints the userd ID on the terminal
+
+Q5 (a) how to change group of any folder
+       chgrp [options] group filename
+
+   (b)group name of files present in the folder
+      ls -ld

PUSAPATI SWETHA/assignment2- 08.04.2020.txt

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+Q) how to unzip a bz2 file
+   first type tar xzff filename.tar.bz2 which uncompresses a bzip2 tar file
+
+Q) how to add a user and at the same time we must chnage shell of the user
+   useradd -s /bin/bash/bin/rbash <username>

PUSAPATI SWETHA/assignment3- 10.04.2020.txt

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+Q) difference between ascii and unicode
+   ASCII uses 7 bits to encode each character whereas unicode uses a variable bit encoding program where we can choose between 8,16, 32 bit encodings
+
+Q) what are the python complilers
+   1. CPython 2.JPython 3.IronPython 4. ActivePython 5.PyJS 6. Nutika 7.Stackless Python 

PUSAPATI SWETHA/assignment4- 11.04.2020.txt

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+Q) output of 3+4**6-9*10/2
+   4054 ( 1. 4**6=4096    2. 10/2=5    3. 9*5=45   4. 3+4096=4099 5. 4099-45=4054)
+Q)string given is "hello this side is regex" count the number of vowels
+  str = "hello this side regex"
+  str1 = str.lower()
+  vow=0
+  for i in str1:
+    if(i=='a'or i=='e' or i=='o' or i=='i' or i=='u')
+      vow=vow+1
+  print("number of vowels are ")
+  print (vow)
+
+Q) calculate area of triangle
+   print("enter the base of triangle")
+   b = int(input())
+   print("enter the height of triangle")
+   h = int(input())
+   area = 0.5*b*h
+   print("area is ")
+   print (area)
+
+Q) print calendar of the year given a input
+   import calendar
+   print("enter year and then the month")
+   y = int(input())
+   m = int(input())
+   print(calendar.month(y,m))

PUSAPATI SWETHA/assignment5- 12.04.2020.txt

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+Q) armstrong number in a range
+
+   l = int(input("enter the lower range:"))
+   u = int(input("enter the upper range:"))
+   for num in range(lower,upper+1):
+    sum=0
+    i=num
+     while i >0 :
+       d = 1%10
+       sum+=d**3
+       i/=10
+    if num == sum
+      print(num)
+
+Q) to remove special characters in a given string 
+   str1 = (input("enter the string:"))
+   str2 = " "
+   for i in str1:
+     if i.isalnum()
+        str2 += i
+   print(str2)
+
+Q) to sort the given list and explain the output 
+   ls1 = ["apple", "banana", "cat", "REGEX", "Apple"] 
+   ls1.sort()
+   print("sorted list")
+   print(ls1)
+
+   output: ["Apple", "REGEX", "apple", "banana", "cat"]
+   Explanation: A has the ASCII value of 65 which is the least hence appears first in the sorted output. 
+   We then get REGEX in the output instead of apple because R has the AScCII value 82 whereas a, b, c have ASCII values 97, 98, 99 respectively.
+   The sort() sorts in ascending order of the ASCII values.

PUSAPATI SWETHA/assignment6- 13.04.2020.txt

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+Q) print first letter of each character of strings in the list and add it to 
+a new list
+
+LIST_STATES = ["GOA","RAJASTHAN","KARNATAKA","GUJRAT","MANIPUR",
+MADHYA PRADESH]
+a = [ ]
+for x in LIST_STATES:
+    a.append(x[0])
+
+print (a)
+
+Q)Write a program to replace each string with an integer value in a given list of strings.
+The replacement integer value should be a sum of AScci values of each character of type
+corresponding string........
+LIST: ['GAnga', 'Tapti', 'Kaveri', 'Yamuna', 'Narmada' ]
+
+mylist = ['GAnga', 'Tapti', 'Kaveri', 'Yamuna', 'Narmada' ]
+a = [ ]
+for x in mylist:
+    sum=0
+    for i in x:
+        sum += ord(i)
+    a.append(sum)
+print (a)
+
+Q)You have to run your Program at 9:00am. Date: 14th April 2020.
+
+import time()
+a = time.ctime()
+b = a.split(" ")
+if (b[1] == 'apr' && b[2] == 14 && b[3] == 09:00:00)
+	print("your program is now running)
+
+Q)GIve a tuple:
+tuple = ('a','l','g','o','r','i','t','h','m')
+1. Using the concept of slicing, print the whole tuple
+2. delete the element at the 3rd Index, print the tuple.
+
+tupple1 = ('a', 'l', 'g', 'o', 'r', 'i', 't', 'h', 'm')
+x = slice(0,9)
+print(a[x])
+
+tupple1 = ('a', 'l', 'g', 'o', 'r', 'i', 't', 'h', 'm')
+y = list(tupple)
+y[2] = " "
+tupple1 = tuple(y)
+
+print(tupple1)
+
+Q)Take a list REGex=[1,2,3,4,5,6,7,8,9,0,77,44,15,33,65,89,12]
+- print only those numbers greator then 20
+- then print those numbers those are less then 10 or equal to 10
+- store these above two list in two different list.
+
+REGex = [1,2,3,4,5,6,7,8,9,0,77,44,15,33,65,89,12]
+list1 = [ ]
+list2 = [ ]
+for i in REGex:
+	if i>20:
+		print (i)
+		list1.append(i)
+for j in REGex:
+	if j>=10:
+		print(j)
+		list2.append(j)
+

PUSAPATI SWETHA/assignment7- 14.04.2020.txt

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+Q)Output Should be :
+Loading.
+Loading..
+Loading...
+Loading....
+Loading.....
+Here it shows you 5 output but you have to print only "Loading....." in animated
+form.
+
+import time 
+i = 0
+for i in range(5)
+	time.sleep(2)
+	print("loading..")
+
+Q) Difference between Return and Yield ?
+
+return: * it sends a specified value back to its caller
+        * causes a function to exit
+        * terminates the execution of a function & destroys local variables
+
+yield:  * used to define generators
+        * replaces the return value of a function to suspend its execution without
+        destroying the local variables
+        * used when the generator returns an intermediate result to caller
+
+Q)Add anything in tuple.. example: (1,2,3,4) -> new tuple (1,2,3,4,5)
+
+x = (1,2,3,4)
+y = list(x)
+y[4] = 5
+x = tuple(y)
+print(x)
+
+Q)WhatsApp texting using webbrowser Lib.
+
+import webbrowser
+webbrowser.open_new_tab("https://web.whatsapp.com/")
+
+Q)Make digital Clock and run it for 5 sec.
+Output:
+16:39:08
+:09
+:10
+:11
+:12
+
+import time
+
+for i in range(5)
+	a = str(time.ctime())
+	b = a.split(" ")
+	print(b[3])
+	time.sleep(1)

PUSAPATI SWETHA/assignment8- 16.04.2020.txt

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+Q)Write a Python program to read a file line by line and store it into a list.
+  def readfile(fname):
+        with open(fname) as f:
+                list = f.readlines()
+                print(list)
+   readfile('test.txt')
+
+Q)Write a Python program to read a file line by line store it into an array.
+  def readfile(fname):
+        array = []
+        with open(fname) as f:
+                for line in f:
+                        array.append(line)
+                print(array)
+
+readfile('test.txt')
+
+Q)Write a Python program to read a random line from a file.
+  import random
+  def random_line(fname):
+      lines = open(fname).read().splitlines()
+      return random.choice(lines)
+  print(random_line('test.txt'))
+
+Q)Write a Python program to combine each line from first file with the
+  corresponding line in second file
+  with open('abc.txt') as fh1, open('test.txt') as fh2:
+    for line1, line2 in zip(fh1, fh2):
+           print(line1+line2)
+
+Q)Write a Python program to generate 26 text files named A.txt, B.txt, and
+  so on up to Z.txt.
+  import string, os
+  if not os.path.exists("letters"):
+     os.makedirs("letters")
+  for letter in string.ascii_uppercase:
+     with open(letter + ".txt", "w") as f:
+         f.writelines(letter)
+
+Q)Write a Python program to create a file where all letters of English
+  alphabet are listed by specified number of letters on each line.
+  import string
+  def letters_file_line(n):
+     with open("words1.txt", "w") as f:
+         alphabet = string.ascii_uppercase
+         letters = [alphabet[i:i + n] + "\n" for i in range(0, len(alphabet), n)]
+         f.writelines(letters)
+  letters_file_line(3)
+
+Q)webscraping
+  import requests
+from bs4 import BeautifulSoup
+url = "https://www.worldometers.info/coronavirus/"
+page = requests.get(url)
+soup = BeautifulSoup(page.content, 'html.parser')
+b = soup.find("div", {"class":"maincounter-number"})
+c = soup.findAll("h1")
+for i in c:
+    print(i.text)

PUSAPATI SWETHA/aws assignment.txt

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+1.	What if the .pem key file or the .ppk key file to our ec2 machine is lost?
+In  the cases where the private key file having the RSA is lost, unfortunately there is no wat to get back the key file but there surely is a way to get our instance back.
+To do so we need to perform some tasks listed below:
+
+	Create an Image of the ec2 instance:
+
+1.	Select the instance from EC2 Dashboard
+2.	Under the Actions tab goto image and click Image
+3.	Enter an appropriate image name and image description and Create Image.
+4.	After doing this a request to generate image has successfully been placed on the AWS account. To check the status of image one can go to AMI’s section under IMAGES from the right navigation pane.
+5.	After the image has been created you can launch the new instance using that Image from AMI section or from EC2 Launch Wizard.
+6.	If you launch from EC2 launch wizard be sure you choose the Image that you created, it would be available under “My AMIs” section.
+7.	And do not forget to create a new key pair while launching it.
+8.	Select the image and launch the instance. A new instance with all the data of the old instance is now ready to use.
+9.	The image created can also be further migrated to any other AWS account (not AWS Educate accounts).
+
+
+

PUSAPATI SWETHA/big data assignment.txt

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+Q)differences between hadoop1 and hadoop2.
+
+hadoop1:* it has map reduce
+*it has job tracker and task tracker
+*In Hadoop 1, there is HDFS which is used for storage and top of it, 
+ Map Reduce which works as Resource Management as well as Data Processing.
+ Due to this workload on Map Reduce, it will affect the performance
+*Hadoop 1 is a Master-Slave architecture. It consists of a single master and multiple slaves. 
+Suppose if master node got crashed then irrespective of your best slave nodes, your cluster will be destroyed. 
+Again for creating that cluster means copying system files, image files, etc. on another system is too much time consuming which will not be tolerated by organizations in today’s time.
+
+
+hadoop2:*it has YARN
+*it has resource manager and node manager
+*In Hadoop 2, there is again HDFS which is again used for storage and on the top of HDFS, there is YARN which works as Resource Management. 
+It basically allocates the resources and keeps all the things going on.
+*Hadoop 2 is also a Master-Slave architecture. But this consists of multiple masters (i.e active namenodes and standby namenodes) and multiple slaves. 
+If here master node got crashed then standby master node will take over it. You can make multiple combinations of active-standby nodes. 
+Thus Hadoop 2 will eliminate the problem of a single point of failure.
+
+
+Q) why hadoop has block of 128 mb
+
+ minimize the cost of seek and reduce the meta data information generated per block.
+
+
+Q)why does name node rely on memory
+The namenode keeps all of the filesystem layout information (files, blocks, directories, permissions, etc) and the block locations. 
+The filesystem layout is persisted on disk and the block locations are kept solely in memory

PUSAPATI SWETHA/whatsapp python.txt

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+import requests as rq 
+import pyautogui as pg
+import webbrowser as wb  
+num=[] 
+message=input("Enter your message: ") 
+count=int(input("How many person you want to send message: ")) 
+Message=int(input("How many message you want to send: ")) 
+for i in range(count): 
+	n=int(input("Enter Contact Number followed by 91: ")) 
+	num.append(num)
+for a in range(count): 
+	time.sleep(2) 
+	link="https://web.whatsapp.com/send?phone={}&text={}".format(number[a],message) 
+wb.open(link) 
+time.sleep(15)
+print("Page timeout") 
+pg.press("enter") 
+for x in range(Message): 
+	pg.typewrite(message) 
+	pg.press("enter") 
+	time.sleep(2) 
+	pg.hotkey("ctrl","w") 
+	pg.press("enter") 
+	print("Mesage sent to {} message is {}".format(number[a],message)) 
+print("message sent")