Computer Science - Informatics Practices Class XI/XII Python Dictionary Solved Test  Part 5

Q1. Explain the following functions in reference to dictionary.

a. items()

b. keys()

c. values()

Q2. Write the output of the following:

a={1:10,2:20,3:30}

b={3:35,4:40}

print(a.items())

print(a.keys())

print(a.values())

Q3. Write a program to store details like book

number, author name and price in dictionary.

Q4. To delete an element from dictionary, we can

use either _______ statement of ______ method.

Q5. What is the difference between list and

dictionary?

Q6. Why list can not be used as keys in dictionary?

Q7. a={1:10,2.5:20,3:30,4:40,5:50}

Find errors in the following and write the correct

statement

1. a(6) = 60
2. a.len()
3. a.clears()
4. a.gets(3)
5. a.item()
6. a.valueS()
7. a.keyS()
8. a.del(4)
9. pop(4)

                 SOLUTIONS

Q1. Explain the following functions in reference

to dictionary.

a. items()

b. keys()

c. values()

Ans. a. items() : This method returns the content

of dictionary as a list of tuples having key-value

pairs.

 b. keys() : It returns the list of key values in

dictionary.

 c. values(): It returns the list of values from

dictionary.

Q2. Write the output of the following:

a={1:10,2:20,3:30}

b={3:35,4:40}

print(a.items())

print(a.keys())

print(a.values())

Ans. dict_items([(1, 10), (2, 20), (3, 30)])      dict_keys([1, 2, 3]) dict_values([10, 20, 30])

Q3. Write a program to store details like book

number, author name and price in dictionary.

Ans. b={}

n=int(input("Enter number of records to enter"))

for i in range(n):

bno=int(input("Enter book number"))

bn=input("Enter book name")

pr=int(input("Enter price"))

t=(bn,pr)

b[bno]=t

print(b)

Q4. To delete an element from dictionary, we can

use either _______ statement of ______ method.

Ans. del, pop()

Q5. What is the difference between list and

dictionary?

List	Dictionary
Elements are enclosed in square brackets	Elements are enclosed in curly braces
Index value is an integer only	Index value can be of any type.

Q6. Why list can not be used as keys in dictionary?

Ans. Because list are mutable.

Q7. a={1:10,2.5:20,3:30,4:40,5:50}

Find errors in the following and write the correct

statement

1. a(6) = 60
2. a.len()
3. a.clears()
4. a.gets(3)
5. a.item()
6. a.valueS()
7. a.keyS()
8. a.del(4)
9. pop(4)

Ans.

1. a[6]=60
2. len(a)
3. a.clear()
4. a.get(3)
5. a.items
6. a.values()
7. a.keys()
8. del a[4]
9. a.pop(4)

Computer Science - Informatics Practices Class XI/XII Python Dictionary Solved Test  Part 4

Q1.  d1 = {1 : 'One' , 2 : "Two", 3 : "Three"}

        d2 = { 5 : "Five", 6 : "Six"}

Write the code of the following, in reference to the above dictionary

a. Write a for loop to print only keys of d1.

b. Write a for loop to print only values of d1.

c. Write a for loop to print both keys and values of d1 in the following format.

          1-------One

          2------Two

d. Add one more pair (4 : "Four") in d1

e. Modify the value of key 2. (make it "Too" in place "Two") 

f. Merge d1 and d2 in d1.

Q2. What do you mean by update() function in dictionary?

Q3. Write the output of the following code :

Q4. What is the difference between del command and pop() function in context of 

      dictionary?

Q5.  a={1:10,2:20,3:30}

1. Write code to delete the second element using del command.
2. Write code to delete the third element using pop() function.

Q6. Write the output of the following code.

                a={1:10,2:20,3:30}

        b={3:35,4:40}

        print(1 in a)

        print(3 in b)

        print(4 in a)

        print(max(a))

        print(min(a))

        print(max(b))

        print(min(b))

        print(sum(a))

        print(sum(b))

        print(len(b))

        print(len(a))

Q7. What do you mean by clear() function in reference to dictionary?

Q8. get() method returns ______(key or value) in dictionary.?

Q9. get() method returns ______, if key does not

exist in dictionary.

Q10. get() method takes the key or value as

argument.

                          

SOLUTION

Q1.  d1 = {1 : 'One' , 2 : "Two", 3 : "Three"}

        d2 = { 5 : "Five", 6 : "Six"}

Write the code of the following, in reference to the above dictionary

a. Write a for loop to print only keys of d1.

b. Write a for loop to print only values of d1.

c. Write a for loop to print both keys and values of d1 in the

following format.

          1-------One

          2------Two

d. Add one more pair (4 : "Four") in d1

e. Modify the value of key 2. (make it "Too" in place "Two") 

f. Merge d1 and d2 in d1.

Ans. a. for i in d1:

print(i)

b. for i in d1:

print(a[i])

c. for i in d1:

print(i,"------",a[i])

d. d1[4]="Four"

e. d1[2] = 'Too'

f. d1.update(d2)

Q2. What do you mean by update() function in dictionary?

Ans. update() function is used to merge two dictionaries

into one dictionary

Q3. Write the output of the following code :

Ans. {1:10,2:20,3:30}

{3:35,4:40}

{1:10,2:20,3:35,4:40}

{3:35,4:40}

Q4. What is the difference between del command and pop()

function in context of dictionary?

Ans. pop() method return the deleted element while del statement

does not return the deleted element.

Q5.  a={1:10,2:20,3:30}

1. Write code to delete the second element using del command.
2. Write code to delete the third element using pop() function.

Ans 1. del(a[2])

2. a.pop(3)

Q6. Write the output of the following code.

                a={1:10,2:20,3:30}

        b={3:35,4:40}

        print(1 in a)

        print(3 in b)

        print(4 in a)

        print(max(a))

        print(min(a))

        print(max(b))

        print(min(b))

        print(sum(a))

        print(sum(b))

        print(len(b))

        print(len(a))

Ans.

        True         True         False         3         1         4         3         6         7         2         3

Q7. What do you mean by clear() function in

reference to dictionary?

Ans. clear() function removes all the elements from dictionary.

Q8. get() method returns the key or a value

in dictionary.

Ans. get() method returns a value for the given key.

Q9. get() method returns ______, if key does not

exist in dictionary.

Ans. None

Q10. get() method takes the key or value as

argument.

Ans. key

Computer Science - Informatics Practices Class XI/XII Python Dictionary Solved Test  Part 3

Q1. Can we add new values in an existing dictionary?
Q2. Write a code to add the following key-value to a given dictionary.

    a = {'Class':'VI','Sec':'B','Rollno' : 1}

    

        

Q3. Can we do modification in existing key value pair?

Q4. Write the code to change the class of given

dictionary to 'VII'

a = {'Class':'VI','Sec':'B','Rollno' : 1}

Q5. What do you mean by update() in context of

dictionary in python

   

Q6. What is the difference between del command and pop() 

     function in dictionaries?

Q7. Write the output of the following:

    a = {'Class':'VI','Sec':'B','Rollno' : 1}

    print('Class' in a)

    print('sec' in a)

Q8. Can there be any dictionary without key or

without value?if yes then give example.

Q9. Which function return the count of

    key-value pairs in the given dictionary.

Q10. Which function removes all the items from

    dictionary?

                              

Computer Science - Informatics Practices Class XI/XII Python Dictionary Solved Test  Part 2

Q1. Name a function which is used to create an empty dictionary.

Q2. What empty curly braces({}) shows in python?

Q3. Write the output of the following: 

        a = {}

        a[1]='A'

        a[2]='B'

        a[3]='C'

        print(a)

Q4. Write the output of the following:

        a = {'Class':'VI','Sec':'B','Rollno' : 1}

        print(a)

        print(a['Class'])

        print(a['Sec'])

        print(a['roll'])

if any of the above print statement return an error

than identify the error type.

Q5. a = {'Class':'VI','Sec':'B','Rollno' : 1}

    for i in a:

    print(i)

Q6. a = {'Class':'VI','Sec':'B','Rollno' : 1}

    for i in a:

    print(a)

Q7. a = {'Class':'VI','Sec':'B','Rollno' : 1}

    for i in a:

    print(a[i])

Q8. a = {'Class':'VI','Sec':'B','Rollno' : 1}

    for i in a:

      print(a[i])

    print(a[i])

Q9. What type of error shows by the following program:

    a = {'Class':'VI','Sec':'B','Rollno' : 1}

    for i in len(a):

    print(a[i])

Q10. What do you mean by traversing a dictionary?

Solution:

Q1. Name a function which is used to create an empty dictionary.

Ans. dict()

Q2. What empty curly braces({}) shows in python?

Ans. Curly braces shows empty dictionary in python.

Q3. Write the output of the following: 

        a = {}

        a[1]='A'

        a[2]='B'

        a[3]='C'

        print(a)

Ans. {1 : 'A', 2 : 'B', 3 : 'C'}

Q4. Write the output of the following:

        a = {'Class':'VI','Sec':'B','Rollno' : 1}

        print(a)

        print(a['Class'])

        print(a['Sec'])

        print(a['roll'])

if any of the above print statement return an error

than identify the error type.

Ans. {'Class': 'VI', 'Sec': 'B', 'Rollno': 1}      VI B

Last print statement will show "key error" as 'roll' key

is not there in dictionary

Q5. a = {'Class':'VI','Sec':'B','Rollno' : 1}

    for i in a:

    print(i)

Ans. Class

Sec

Rollno

Q6. a = {'Class':'VI','Sec':'B','Rollno' : 1}

    for i in a:

    print(a)

Ans. {'Class':'VI','Sec':'B','Rollno' : 1}

{'Class':'VI','Sec':'B','Rollno' : 1}

{'Class':'VI','Sec':'B','Rollno' : 1}

Q7. a = {'Class':'VI','Sec':'B','Rollno' : 1}

    for i in a:

    print(a[i])

Ans. VI

B

1

Q8. a = {'Class':'VI','Sec':'B','Rollno' : 1}

    for i in a:

      print(a[i])

    print(a[i])

Ans. VI

B

1

1

Q9. What type of error shows by the following program:

    a = {'Class':'VI','Sec':'B','Rollno' : 1}

    for i in len(a):

    print(a[i])

Ans. TypeError: 'int' object is not iterable

Q10. What do you mean by traversing a dictionary?

Ans. Traversing a dictionary means accessing each element of

dictionary. This can be done by using for loop.

Computer Science - Informatics Practices Class XI/XII Python Dictionary Solved Test  Part 1

Q1. Is dictionary in python is a collection or a sequence?

Q2. What do you mean by dictionary in python?

Q3 In dictionary we have _________ value concept.

Q4, In dictionary , key and it's value are separated by ________.

Q5. Entire dictionary is enclosed in _______ braces

Q6. Dictionary is _________(mutable/immutable)

Q7. The ______ of dictionary can be of any type but the _______ must be of immutable type.

Q8. Each key is associated with value.(T/F)

Q9. Write the code to create empty dictionary named 'd'

Q10. Write the output of the following:

            >>> a = {}

            >>>print(type(a))

Solution:

Q1. Is dictionary in python is a collection or a sequence?

Ans : Collection

Q2. What do you mean by dictionary in python?

Ans : Python dictionary is an unordered collection of items where each item is a KEY-VALUE pair

Q3 In dictionary we have _________ value concept.

Ans. Key

Q4, In dictionary , key and it's value are separated by ________.

Ans. colon(:)

Q5. Entire dictionary is enclosed in _______ braces

Ans. Curly -{ }

Q6. Dictionary is _________(mutable/immutable)

Ans. mutable

Q7. The ______ of dictionary can be of any type but the _______ must be of immutable type.

Ans 7- values, key

Q8. Each key is associated with value.(T/F)

Ans. True

Q9. Write the code to create empty dictionary named 'd'

Ans. d={ }

Q10. Write the output of the following:

            >>> a = {}

            >>>print(type(a))

Ans. <class 'dict'>