Python Programming Quiz

Quiz on Dictionary in Python

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Q.1. In a dictionary, the keys are mutable but values are immutable

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In a dictionary, keys are immutable and values are mutable.

Q.2. Are orders retained in a dictionary?

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As of Python version 3.7, dictionaries are ordered

Q.3. Output of following code 
          
            d1 = {"k1":5, "k2":6}
            d2 = {"k2":6, "k1":5}
            print(d1 == d2)

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Both the dictionaries have same keys and values. Hence, they are equal.

Q.4. Which of the following is Incorrect way of creating a dictionary

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An empty dictionary can be created by either a or b methods but not c.

Q.5. What is the output of following program? 
          
            d = {1:1, 2:4, 3:9, 4:16, 5:25}
            print(d.keys())

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keys() is a method in Python Dictionary which returns a view object that displays all a list of all the keys in the dictionary.

Q.6. Do all the keys in a dictionary must have same data type?

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It is not mandatory for all the keys in a dictionary to have the same data type. The keys must be of an immutable data type such as strings, numbers, or tuples.

Q.7. What is the output of following program? 
          
            d = {1:1, 2:4, 3:9, 4:16, 5:25}
            d.pop(2)
            print(d)

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The pop() function removes the specified item from the dictionary. In the given snippet, the specified item is identified by the key number 2. Hence, it will be removed from the dictionary.

Q.8. What is the output of following program? 
          
            d = {1:'apple',2:'mango',3:'banana',2:'pear'}
            print(d)

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A Python dictionary stores mappings of unique keys to values. Hence, a key cannot be repeated. If it is repeated, the old value of the key will be over-written by the new value. Hence, in given snippet, 'mango' is over-written by 'pear'.

Q.9. What is the output of the following code snippet? 
          
            d = {[1,2]:'a',3:'b',4:'c'}
            print(d)

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A key in dictionary must be of an immutable data type such as strings, numbers, or tuples. A list is a mutable data type. Hence, we cannot use list to define a key in the dictionary.

Q.10. What is the output of the following code snippet?
          
            d = {2:'a',3:'b',4:'c'}
            d[1] = 'd'
            print(d)

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A new key (1) and value ('d') is inserted at the end of the dictionary.

Q.11. What is the output of the following code snippet? 
          
            d = {1:1, 2:4, 3:9}
            for key,val in d.items():
                print(key,val, end=" ")

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All the keys and values present in the dictionary are printed, each followed with a space.

Q.12. What is the output of the following code snippet? 
          
            d = {1: 'a', 2: 'b', 3: {'4': 'c', '5': 'd', '6': 'e'}}
            print(d)

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A key in dictionary must be of an immutable data type such as strings, numbers, or tuples. However, values can be either mutable or immutable. In the given snippet, the value of key 3 is another dictionary. This will not give an error as value are allowed to have mutable data types such as lists or dictionaries.

Q.13. What is the output of the following code snippet?
          
            d = {1:'apple',2:'mango',3:'banana',4:'pear'}
            print(d[2])

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The value for key = 2 in the dictionary will be printed.

Q.14. What is the output of the following code snippet?
          
            d = {1:1, 2:4, 3:9, 4:16, 5:25}
            d.popitem()
            d.popitem()
            print(d)

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popitem() is a method of Python dictionary which removes the last inserted item of the dictionary. Hence, the last 2 items will be popped when the function is called twice.

Q.15. Which of these about a dictionary is NOT true?

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Values of a dictionary can be accessed by using key but not vice versa.

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