MCQs for Python Dictionaries: Exam-Style Practice Page-8 section-1

71.

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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72.

What will be the output of the following Python code?

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

A. 1

B. 0

C. An exception is thrown

D. ' '

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73.
Suppose d = {"john":40, "peter":45}, what happens when we try to retrieve a value using the expression d["susan"]?

A. Since "susan" is not a value in the set, Python raises a KeyError exception

B. It is executed fine and no exception is raised, and it returns None

C. Since "susan" is not a key in the set, Python raises a KeyError exception

D. Since "susan" is not a key in the set, Python raises a syntax error

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74.

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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75.

What will be the output of the following Python 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]

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76.

What will be the output of the following Python code?

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

A. 4

B. 0

C. An exception is thrown

D. 7

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77.

What will be the output of the following Python 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'}

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78.
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

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79.

What will be the output of the following Python code?

>>> 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'}

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80.

What will be the output of the following Python code?

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

A. { }

B. False

C. True

D. An exception is thrown

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71.
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)`

Answer & Solution

72.
What will be the output of the following Python code?

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

Answer & Solution

73.
Suppose d = {"john":40, "peter":45}, what happens when we try to retrieve a value using the expression d["susan"]?

Answer & Solution

74.
What will be the output of the following Python code snippet?

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

Answer & Solution

75.
What will be the output of the following Python code?

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

Answer & Solution

76.
What will be the output of the following Python code?

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

Answer & Solution

77.
What will be the output of the following Python code?

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

Answer & Solution

78.
Which of the following isn't true about dictionary keys?

Answer & Solution

79.
What will be the output of the following Python code?

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

Answer & Solution

80.
What will be the output of the following Python code?

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

Answer & Solution

MCQs for Python Dictionaries: Exam-Style Practice

71. 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)

Answer & Solution

72. What will be the output of the following Python code? >>> import collections >>> a=dict() >>> a=collections.defaultdict(int) >>> a[1]

Answer & Solution

73. Suppose d = {"john":40, "peter":45}, what happens when we try to retrieve a value using the expression d["susan"]?

Answer & Solution

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

Answer & Solution

75. What will be the output of the following Python code? >>> a={'B':5,'A':9,'C':7} >>> sorted(a)

Answer & Solution

76. What will be the output of the following Python code? >>> import collections >>> b=dict() >>> b=collections.defaultdict(lambda: 7) >>> b[4]

Answer & Solution

77. What will be the output of the following Python code? >>> a={"a":1,"b":2,"c":3} >>> b=dict(zip(a.values(),a.keys())) >>> b

Answer & Solution

78. Which of the following isn't true about dictionary keys?

Answer & Solution

79. What will be the output of the following Python code? >>> a={i: 'A' + str(i) for i in range(5)} >>> a

Answer & Solution

80. What will be the output of the following Python code? >>> b={} >>> all(b)

Answer & Solution

71.
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)`

72.
What will be the output of the following Python code?

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

73.
Suppose d = {"john":40, "peter":45}, what happens when we try to retrieve a value using the expression d["susan"]?

74.
What will be the output of the following Python code snippet?

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

75.
What will be the output of the following Python code?

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

76.
What will be the output of the following Python code?

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

77.
What will be the output of the following Python code?

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

78.
Which of the following isn't true about dictionary keys?

79.
What will be the output of the following Python code?

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

80.
What will be the output of the following Python code?

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