NPTEL » Python for Data Science

Assignment 2

Due date: 2019-09-11, 23:59 IST.

Your last recorded submission was on 2019-09-10, 10:56 IST

1 point

Package that deals with dataframe is

 numpy

 dataframe

 pandas

 math

1 point

The data type of the following python object 'a' is: a={23, 24, 25, 26, 27}

 list

 dictionary

 set

 arrays

1 point

Variable ‘a’ is defined as
       a = ‘gOOd moRning’
       Command to convert ‘a’ from ‘gOOd moRning’ to ‘Good Morning’ is:-

 a.upper( )

 a.lower( )

 a.string( )

 a.title( )

1 point

Which of the following python data structure is immutable?

 list

 dictionary

 tuple

 array

1 point

Identify the braces used to create a dictionary in Python.

 ( )

 { }

 [ ]

 All of the above

1 point

The command used to add elements to a list

 append( )

 extend( )

 insert( )

 all of the above( )

Using the list ‘Stationery’ answer questions 7-8

Product = ['Pencil', 'Pen', 'Eraser', 'Pencil Box', 'Scale']

Price= [5, 10, 2, 20, 12]  

Brand = ['Camlin', 'Rotomac', 'Nataraj', 'Camel', 'Apsara']

Stationery = [Product, Price, Brand]

1 point

The command to add “Notebook” as the first element inside the first level of the list      “Stationery” is:-

 Stationery[0].append('Notebook')

 Stationery[0].insert(0,'Notebook')

 Stationery[0][1] = "Notebook"

 Stationery[0].extend('Notebook')

1 point

Command to replace the element of Brand, “Camel” with “Camlin” inside the list is:-

 Stationery[2][3].append('Camlin')

 Stationery[2].insert(3,'Camlin')

 Stationery[2][3] = "Camlin"

 none of the above

1 point

The list "Months" is defined as:-

       Months = ['Jan', 'Mar', 'June', 'Aug', 'June', 'Feb', 'Nov', 'Dec', 'June', 'Apr', 'May',     'June']

       Which of the following commands returns the number of occurrences of ‘June’?

 Months.count('June')

 Months.len('June')

 Months[‘June’].count()

 Months[‘June’].len()

1 point

 Choose the correct command to sort 'Ages' in ascending order

    Ages = [ ’20’, ‘26’, ‘56’, ‘54’, ‘32’, ‘28’, ‘23’, ‘99’, ‘87’, ‘10’, ‘65’, ‘88’, ‘66’,
                  ‘48’, ‘42’, ‘27’, ‘33’, ‘38’,  ‘83’, ‘94’, ‘66’, ‘44’]

 sorted(Ages, reverse=False)

 Ages.sort()

 sorted(Ages, reverse=True)

 both A and B

Answer questions 11 and 12 using the information given below: 
   

 D = [‘MONDAY’, ‘TUESDAY’,  ‘WEDNESDAY’, ‘THURSDAY’, ‘FRIDAY’, ‘SATURDAY’, ‘SUNDAY’]

1 point

 The command to print WEDNESDAY, THURSDAY from the list “D” is

 print(D[-5], D[-4])

 print(D[3], D[4])

 print(D[2:5]) 

 all of the above

1 point

 The command used to reverse the above list “D” is:-

 reverse(D)

 D.reverse()

 list(reversed(D))

 both B and C

1 point

 The command to clear all the elements from a Set is:-

 remove( )

 discard( )

 clear( )

 all of the above( )

Answer questions 14 and 15 using the information given below:   

Mylist =[‘a’, ‘a’, ‘b’, ‘b’, ‘b’, ‘c’, ‘c’, ‘d’, ‘e’] 

1 point

 The output of the code: Mylist.index(‘d’) is

 7

 8

 4

 6

1 point

 The output after you run the command:
         Mylist.pop(0)         print(Mylist)

 [‘a’, ‘a’, ‘b’, ‘b’, ‘b’, ‘c’, ‘c’, ‘d’, ‘e’]

 [‘a’, ‘b’, ‘b’, ‘b’, ‘c’, ‘c’, ‘d’, ‘e’]

 [‘a’, ‘a’ ‘b’, ‘b’, ‘b’, ‘c’, ‘c’, ‘d’] 

 [‘b’, ‘b’, ‘b’, ‘c’, ‘c’, ‘d’, ‘e’]

1 point

 The command to find the number of elements in the following list “N”
          N = [24, 27, 29, 26, 25, 23, 20]

 len(N)

 N.count()

 N.len()

 count(N)

Create a dictionary ‘Country’ that maps the following countries to their capitals respectively. 

1 point

 The command to replace “Sydney” with “Canberra” is:-

 Country['Australia']="Canberra"

 Country.update({"Australia":"Canberra"})

 Both A and B

 None of the above

Create the following sets X1 and X2 using the data provided below and answer the questions 18 and 19

1 point

 The output of X1.intersection(X2) will be

 {0,1,7,8}

 {1,3,7,8}

 {1,2,7,8}

 {1,4,7,8}

1 point

 The command X1.symmetric_difference(X2)

 returns all elements belonging to both set X1 and X2

 returns elements belonging to X1 but not X2

 returns elements not common to both sets X1 and X2

 returns elements common to X1 and X2

1 point

Which of the following is a code template for creating objects in Python?

 list

 set

 dictionary 

 class

Create the following Matrix “Y” in Python and answer questions 21 to 23 :

1 point

  The determinant of the matrix “Y” rounded off to the zeroth decimal place is

 110

 120

 0

 1

1 point

  Inverse of matrix “Y” rounded off to second decimal place is

 ([[- 0.73, 0.68, 0.11],

 [0.09,  -0.27, 0.04],

 [0.18,  0.05,  -0.13]])

([[ 0.73, -0.68, -0.11],

[-0.09,  0.27, -0.04],

[-0.18,  0.05,  0.13]])

 ([[ 0.73, 0.68, 0.11],

[0.09,  0.27, 0.04],

[0.18,  0.05,  0.13]])

([[- 0.73, -0.68, -0.11],

[-0.09,  -0.27, -0.04],

[-0.18,  -0.05, -0.13]])

1 point

  The column sum of YT is

 matrix([[11, 27, 25]])

 matrix([[19, 14, 25]])

 matrix([[19, 14, 30]])

 matrix([[11, 27, 30]])

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