This set of Python Multiple Choice Questions & Answers (MCQs) focuses on “Dictionary – 2”.
1. Which of these about a dictionary is false?
a) The values of a dictionary can be accessed using keys
b) The keys of a dictionary can be accessed using values
c) Dictionaries aren’t ordered
d) Dictionaries are mutable
View Answer
Explanation: The values of a dictionary can be accessed using keys but the keys of a dictionary can’t be accessed using values.
2. Which of the following is not a declaration of the dictionary?
a) {1: ‘A’, 2: ‘B’}
b) dict([[1,”A”],[2,”B”]])
c) {1,”A”,2”B”}
d) { }
View Answer
Explanation: Option c is a set, not a dictionary.
3. What will be the output of the following Python code snippet?
a={1:"A",2:"B",3:"C"} for i,j in a.items(): print(i,j,end=" ")
a) 1 A 2 B 3 C
b) 1 2 3
c) A B C
d) 1:”A” 2:”B” 3:”C”
View Answer
Explanation: In the above code, variables i and j iterate over the keys and values of the dictionary respectively.
4. What will be the output of the following Python code snippet?
a={1:"A",2:"B",3:"C"} print(a.get(1,4))
a) 1
b) A
c) 4
d) Invalid syntax for get method
View Answer
Explanation: The get() method returns the value of the key if the key is present in the dictionary and the default value(second parameter) if the key isn’t present in the dictionary.
5. What will be the output of the following Python code snippet?
a={1:"A",2:"B",3:"C"} print(a.get(5,4))
a) Error, invalid syntax
b) A
c) 5
d) 4
View Answer
Explanation: The get() method returns the default value(second parameter) if the key isn’t present in the dictionary.
6. What will be the output of the following Python code snippet?
a={1:"A",2:"B",3:"C"} print(a.setdefault(3))
a) {1: ‘A’, 2: ‘B’, 3: ‘C’}
b) C
c) {1: 3, 2: 3, 3: 3}
d) No method called setdefault() exists for dictionary
View Answer
Explanation: setdefault() is similar to get() but will set dict[key]=default if key is not already in the dictionary.
7. What will be the output of the following Python code snippet?
a={1:"A",2:"B",3:"C"} a.setdefault(4,"D") print(a)
a) {1: ‘A’, 2: ‘B’, 3: ‘C’, 4: ‘D’}
b) None
c) Error
d) [1,3,6,10]
View Answer
Explanation: setdefault() will set dict[key]=default if key is not already in the dictionary.
8. What will be the output of the following Python 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’}
View Answer
Explanation: update() method adds dictionary b’s key-value pairs to dictionary a. Execute in python shell to verify.
9. What will be the output of the following Python 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
View Answer
Explanation: Changes made in the copy of the dictionary isn’t reflected in the original one.
10. What will be the output of the following Python 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) { }
View Answer
Explanation: The clear() method clears all the key-value pairs in the dictionary.
11. 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
View Answer
Explanation: Keys of a dictionary may be any data type that is immutable.
12. What will be the output of the following Python 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}
View Answer
Explanation: pop() method removes the key-value pair for the key mentioned in the pop() method.
13. What will be the output of the following Python 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
View Answer
Explanation: pop() method returns the value when the key is passed as an argument and otherwise returns the default value(second argument) if the key isn’t present in the dictionary.
14. What will be the output of the following Python code?
a={1:"A",2:"B",3:"C"} for i in a: print(i,end=" ")
a) 1 2 3
b) ‘A’ ‘B’ ‘C’
c) 1 ‘A’ 2 ‘B’ 3 ‘C’
d) Error, it should be: for i in a.items():
View Answer
Explanation: The variable i iterates over the keys of the dictionary and hence the keys are printed.
15. What will be the output of the following Python code?
>>> 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’)])
View Answer
Explanation: The method items() returns list of tuples with each tuple having a key-value pair.
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