Python Questions and Answers – Dictionary – 3

This set of Python Multiple Choice Questions & Answers (MCQs) focuses on “Dictionary – 3”.

1. 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
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2. What will be the output of the following Python code snippet?

>>> 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
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3. 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
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4. What will be the output of the following Python code snippet?

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
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5. What will be the output of the following Python code snippet?

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
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6. What will be the output of the following Python code snippet?

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’}}
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7. What will be the output of the following Python code snippet?

test = {1:'A', 2:'B', 3:'C'}
test = {}
print(len(test))

a) 0
b) None
c) 3
d) An exception is thrown
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8. What will be the output of the following Python code snippet?

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
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9. What will be the output of the following Python code snippet?

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
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10. What will be the output of the following Python code snippet?

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}
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11. What will be the output of the following Python code snippet?

>>>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}
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12. What will be the output of the following Python code snippet?

>>>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)]
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13. What will be the output of the following Python code snippet?

>>>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)]
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14. What will be the output of the following Python code snippet?

>>> import collections
>>> a=collections.Counter([2,2,3,3,3,4])
>>> b=collections.Counter([2,2,3,4,4])
>>> a|b

a) Counter({3: 3, 2: 2, 4: 2})
b) Counter({2: 2, 3: 1, 4: 1})
c) Counter({3: 2})
d) Counter({4: 1})
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15. What will be the output of the following Python code snippet?

>>> import collections
>>> a=collections.Counter([3,3,4,5])
>>> b=collections.Counter([3,4,4,5,5,5])
>>> a&b

a) Counter({3: 12, 4: 1, 5: 1})
b) Counter({3: 1, 4: 1, 5: 1})
c) Counter({4: 2})
d) Counter({5: 1})
View Answer

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