Python Questions and Answers – Dictionary – 4

This set of Python Multiple Choice Questions & Answers (MCQs) focuses on “Dictionary – 4”.

1. The following piece of code is invalid. True or False?

class demo(dict):
  def __test__(self,key):
    return []
a = demo()
a['test'] = 7
print(a)

a) True
b) False
View Answer

2. What is the output of the following code?

count={}
count[(1,2,4)] = 5
count[(4,2,1)] = 7
count[(1,2)] = 6
count[(4,2,1)] = 2
tot = 0
for i in count:
    tot=tot+count[i]
print(len(count)+tot)

a) 25
b) 17
c) 16
d) Tuples can’t be made keys of a dictionary
View Answer

3. What is the output of the following code?

a={}
a[2]=1
a[1]=[2,3,4]
print(a[1][1])

a) [2,3,4].
b) 3
c) 2
d) An exception is thrown
View Answer

4. What is the output of the following piece of code?

>>> a={'B':5,'A':9,'C':7}
>>> sorted(a)

a) [‘A’,’B’,’C’].
b) [‘B’,’C’,’A’].
c) [5,7,9].
d) [9,5,7].
View Answer

5. What is the output of the following snippet of code?

>>> a={i: i*i for i in range(6)}
>>> a

a) Dictionary comprehension doesn’t exist
b) {0: 0, 1: 1, 2: 4, 3: 9, 4: 16, 5: 25, 6:36}
c) {0: 0, 1: 1, 4: 4, 9: 9, 16: 16, 25: 25}
d) {0: 0, 1: 1, 2: 4, 3: 9, 4: 16, 5: 25}
View Answer

6. What is the output of the following piece of code?

>>> a={}
>>> a.fromkeys([1,2,3],"check")

a) Syntax error
b) {1:”check”,2:”check”,3:”check”}
c) “check”
d) {1:None,2:None,3:None}
View Answer

7. What is the output of the following snippet of code?

>>> b={}
>>> all(b)

a) { }
b) False
c) True
d) An exception is thrown
View Answer

8. If b is a dictionary, what does any(b) do?
a) Returns True if any key of the dictionary is true
b) Returns False if dictionary is empty
c) Returns True if all keys of the dictionary are true
d) Method any() doesn’t exist for dictionary
View Answer

9. What is the output of the following code?

>>> a={"a":1,"b":2,"c":3}
>>> b=dict(zip(a.values(),a.keys()))
>>> b

a) {‘a’: 1, ‘b’: 2, ‘c’: 3}
b) An exception is thrown
c) {‘a’: ‘b’: ‘c’: }
d) {1: ‘a’, 2: ‘b’, 3: ‘c’}
View Answer

10. What is the output of the following piece of code when executed in Python shell?

>>> a={i: 'A' + str(i) for i in range(5)}
>>> a

a) An exception is thrown
b) {0: ‘A0’, 1: ‘A1’, 2: ‘A2’, 3: ‘A3’, 4: ‘A4’}
c) {0: ‘A’, 1: ‘A’, 2: ‘A’, 3: ‘A’, 4: ‘A’}
d) {0: ‘0’, 1: ‘1’, 2: ‘2’, 3: ‘3’, 4: ‘4’}
View Answer

11. What is the output of the following piece of code when executed in Python shell?

>>> a=dict()
>>> a[1]

a) An exception is thrown since the dictionary is empty
b) ‘ ‘
c) 1
d) 0
View Answer

12. What is the output of the following piece of code when executed in Python shell?

>>> import collections
>>> a=dict()
>>> a=collections.defaultdict(int)
>>> a[1]

a) 1
b) 0
c) An exception is thrown
d) ‘ ‘
View Answer

13. What is the output of the following piece of code when executed in Python shell?

>>> import collections
>>> a=dict()
>>> a=collections.defaultdict(str)
>>> a['A']

a) An exception is thrown since the dictionary is empty
b) ‘ ‘
c) ‘A’
d) 0
View Answer

14. What is the output of the following piece of code when executed in Python shell?

>>> import collections
>>> b=dict()
>>> b=collections.defaultdict(lambda: 7)
>>> b[4]

a) 4
b) 0
c) An exception is thrown
d) 7
View Answer

15. What is the output of the following piece of code when executed in Python shell?

>>> import collections
>>> a=collections.OrderedDict((str(x),x) for x in range(3))
>>> a

a) {‘2’:2, ‘0’:0, ‘1’:1}
b) OrderedDict([(‘0’, 0), (‘1’, 1), (‘2’, 2)])
c) An exception is thrown
d) ‘ ‘
View Answer

Sanfoundry Global Education & Learning Series – Python.

To practice all areas of Python, here is complete set of 1000+ Multiple Choice Questions and Answers.