Prerequisite: Dictionaries in Python
These question sets will make you conversant with Dictionary Concepts in Python programming language.
Question 1: Which of the following is true about Python dictionaries?
A. Items are accessed by their position in a dictionary.
B. All the keys in a dictionary must be of the same type.
C. Dictionaries are mutable.
D. A dictionary can contain any object type except another dictionary.
Answer: C
Explanation: It means that you can change their content without changing their identity.
Question 2: Suppose we have a dictionary defined as :
Python3
Python = {'Geeks': 100, 'For': 200, 'Geeks': 300}Python ['For':'Geeks'] |
What is the result of this statement:
Python3
Python ['For':'Geeks'] |
A. [200, 300]
B. (200, 300)
C. It raises an exception.
D. 200 300
Answer: C
Explanation: Dictionaries are accessed by key, not by the position of the items. It doesn’t make sense to slice a dictionary.
Question 3: Which of the following could not be a valid dictionary key:
A. len
B. (5+7j)
C. (‘Geeks’,’For’)
D. [‘Geeks’,’For’]
Answer: D
Explanation: A list is a mutable data structure so it cannot be used as a key as it raises the risk of modification and thus, aren’t hashable.
Question 4. Suppose you have the following dictionary defined as-
Python3
Python = {'Geeks': 100, 'For': 200, 'Geeks': 300} |
What method call will delete the entry whose value is 100?
A. push()
B. pop()
C. append()
D. extend()
Answer: B
Explanation: The pop() is an inbuilt function in Python that removes the item from the dictionary provided the key as a parameter.
Question 5. Suppose you have a dictionary d1. Which of the following effectively creates a variable d2 which contains a copy of d1?
A. d2 = dict(d1.keys())
B. d2 = dict(d1.values())
C. d2 = d1
D. d2 = dict(d1.items())
Answer: D
Explanation: The d1 dictionary can be passed directly as an argument to dict() to create a new dictionary.
Question 6. What will be the output of the following code snippet?
Python3
y={16:"Geeks",25:"For",32:"Geeks"}for i,j in y.items(): print(i,j,end=" ") |
A. Geeks For Geeks
B. 16 Geeks 25 For 32 Geeks
C. 16 25 32
D. 16 :”Geeks” 25:”For” 32:”Geeks”
Answer: B
Explanation: Python’s print() function comes with a parameter called ‘end’. By default, the value of this parameter is ‘\n’, i.e. the new line character. You can end a print statement with any character/string using this parameter.
Question 7. What is the correct command to shuffle the following list?
Python3
d = {"Albert":70, "Suzan":85}d["Albert"] |
A. 85
B. “Albert”
C. 70
D. “Suzan”
Answer: C
Explanation: A key can be used to access the value in a dictionary.
Question 8. Which statement defined below can create a dictionary?
A. d = {“Computer”:100, “Programming”:95}
B. d = {100:” Computer”, 95:”Programming”}
C. d = { }
D. All the above.
Answer: D
Explanation: Since there are multiple methods to define dictionary ,all of which are defined above.
Question 9. Which of the following statements can be used for declaration of the dictionary?
A. {23: ‘Geeks’, 26: ‘ForGeeks’}
B. dict([[23,”Geeks”],[26,”ForGeeks”]])
C. {23,”Geeks”,26”ForGeeks”}
D. All the above
Answer: A
Explanation: Because a dictionary has a key and a value which should be defined as {key: value}
Question10. Let us assume d = {“Nobita”:70, “Doremon”:65} . Which command you will use to delete the entry for “Nobita”:
A. d.delete(“Nobita”:70)
B. d.delete(“Nobita”)
C. del d[“Nobita”]
D. del d(“Nobita”:70)
Answer: C
Explanation: The del keyword is used to delete objects. In Python everything is an object, so the del keyword can also be used to delete variables, lists, or parts of a list etc.
