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Total Questions: 20

1. What is the output of the following code? a={1:"A",2:"B",3:"C"} b={4:"D",5:"E"} a.update(b) print(a)

A. {1: ‘A’, 2: ‘B’, 3: ‘C’}

B. Method update() doesn’t exist for dictionaries

C. {1: ‘A’, 2: ‘B’, 3: ‘C’, 4: ‘D’, 5: ‘E’}

D. {4: ‘D’, 5: ‘E’}

Correct Answer is : {1: ‘A’, 2: ‘B’, 3: ‘C’, 4: ‘D’, 5: ‘E’}

2. What is the output of the following code? a={1:"A",2:"B",3:"C"} b=a.copy() b[2]="D" print(a)

A. Error, copy() method doesn’t exist for dictionaries

B. {1: ‘A’, 2: ‘B’, 3: ‘C’}

C. {1: ‘A’, 2: ‘D’, 3: ‘C’}

D. “None” is printed

Correct Answer is : {1: ‘A’, 2: ‘B’, 3: ‘C’}

3. What is the output of the following code? a={1:"A",2:"B",3:"C"} a.clear() print(a)

A. None

B. { None:None, None:None, None:None}

C. {1:None, 2:None, 3:None}

D. { }

Correct Answer is : { }

4. Which of the following isn’t true about dictionary keys?

A. More than one key isn’t allowed

B. Keys must be immutable

C. Keys must be integers

D. When duplicate keys encountered, the last assignment wins

Correct Answer is : Keys must be integers

5. What is the output of the following code? a={1:5,2:3,3:4} a.pop(3) print(a)

A. {1: 5}

B. {1: 5, 2: 3}

C. Error, syntax error for pop() method

D. {1: 5, 3: 4}

Correct Answer is : {1: 5, 2: 3}

6. What is the output of the following code? a={1:5,2:3,3:4} print(a.pop(4,9))

A. 9

B. 3

C. Too many arguments for pop() method

D. 4

Correct Answer is : 9

7. What is the output of the following code? a={1:"A",2:"B",3:"C"} for i in a: print(i,end=" ")

A. 37623

B. ‘A’ ‘B’ ‘C’

C. 1 ‘A’ 2 ‘B’ 3 ‘C’

D. Error, it should be: for i in a.items():

Correct Answer is : 37623

8. Execute the following in Python shell? >>> a={1:"A",2:"B",3:"C"} >>> a.items()

A. Syntax error

B. dict_items([(‘A’), (‘B’), (‘C’)])

C. dict_items([(1,2,3)])

D. dict_items([(1, ‘A’), (2, ‘B’), (3, ‘C’)])

Correct Answer is : dict_items([(1, ‘A’), (2, ‘B’), (3, ‘C’)])

9. Which of the statements about dictionary values if false?

A. More than one key can have the same value

B. The values of the dictionary can be accessed as dict[key].

C. Values of a dictionary must be unique

D. Values of a dictionary can be a mixture of letters and numbers

Correct Answer is : Values of a dictionary must be unique

10. What is the output of the following snippet of code? >>> a={1:"A",2:"B",3:"C"} >>> del a

A. method del doesn’t exist for the dictionary

B. del deletes the values in the dictionary

C. del deletes the entire dictionary

D. del deletes the keys in the dictionary

Correct Answer is : del deletes the entire dictionary

11. If a is a dictionary with some key-value pairs, what does a.popitem() do?

A. Removes an arbitrary element

B. Removes all the key-value pairs

C. Removes the key-value pair for the key given as an argument

D. Invalid method for dictionary

Correct Answer is : Removes an arbitrary element

12. What is the output of the following snippet of code? total={} def insert(items): if items in total: total[items] += 1 else: total[items] = 1 insert('Apple') insert('Ball') insert('Apple') print (len(total))

A. 3

B. 1

C. 2

D. 0

Correct Answer is : 2

13. What is the output of the following snippet of code? a = {} a[1] = 1 a['1'] = 2 a[1]=a[1]+1 count = 0 for i in a: count += a[i] print(count)

A. 1

B. 2

C. 4

D. Error, the keys can’t be a mixture of letters and numbers

Correct Answer is : 4

14. What is the output of the following snippet of code? numbers = {} letters = {} comb = {} numbers[1] = 56 numbers[3] = 7 letters[4] = 'B' comb['Numbers'] = numbers comb['Letters'] = letters print(comb)

A. Error, dictionary in a dictionary can’t exist

B. ‘Numbers’: {1: 56, 3: 7}

C. {‘Numbers’: {1: 56}, ‘Letters’: {4: ‘B’}}

D. {‘Numbers’: {1: 56, 3: 7}, ‘Letters’: {4: ‘B’}}

Correct Answer is : {‘Numbers’: {1: 56, 3: 7}, ‘Letters’: {4: ‘B’}}

15. What is the output of the following snippet of code? test = {1:'A', 2:'B', 3:'C'} test = {} print(len(test))

A. 0

B. None

C. 3

D. An exception is thrown

Correct Answer is : 0

16. What is the output of the following snippet of code? test = {1:'A', 2:'B', 3:'C'} del test[1] test[1] = 'D' del test[2] print(len(test))

A. 0

B. 2

C. Error as the key-value pair of 1:’A’ is already deleted

D. 1

Correct Answer is : 2

17. What is the output of the following snippet of code? a = {} a[1] = 1 a['1'] = 2 a[1.0]=4 count = 0 for i in a: count += a[i] print(count)

A. An exception is thrown

B. 3

C. 6

D. 2

Correct Answer is : 6

18. What is the output of the following snippet of code? a={} a['a']=1 a['b']=[2,3,4] print(a)

A. Exception is thrown

B. {‘b’: [2], ‘a’: 1}

C. {‘b’: [2], ‘a’: [3]}

D. {‘b’: [2, 3, 4], ‘a’: 1}

Correct Answer is : {‘b’: [2, 3, 4], ‘a’: 1}

19. What is the output of the following piece of code? >>>import collections >>> a=collections.Counter([1,1,2,3,3,4,4,4]) >>> a

A. {1,2,3,4}

B. Counter({4, 1, 3, 2})

C. Counter({4: 3, 1: 2, 3: 2, 2: 1})

D. {4: 3, 1: 2, 3: 2, 2: 1}

Correct Answer is : Counter({4: 3, 1: 2, 3: 2, 2: 1})

20. What is the output of the following piece of code? >>>import collections >>> b=collections.Counter([2,2,3,4,4,4]) >>> b.most_common(1)

A. Counter({4: 3, 2: 2, 3: 1})

B. {3:1}

C. {4:3}

D. [(4, 3)].

Correct Answer is : [(4, 3)].