Class 12 CS Chapter 2 Back Exercise Part A Solutions Sumita Arora New Syllabus

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19. Create a dictionary named D with three entries, for keys ‘a’, ‘b’ and V . What happens if you try to index a nonexistent key (D[‘d’]) ? What does Python do if you try to assign to a nonexistent key d (e.g., D[‘d’]=’spam’) ?
1. What is the internal structure of Python strings ?
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2. Write a Python script that traverses through an input string and prints its characters in different lines – two characters per line.
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3. Discuss the utility and significance of Lists, briefly.
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5. Start with the list [8, 9, 10]. Do the following :
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7. What are the two ways to add something to a list ? How are they different ?
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8. What are the two ways to remove something from a list? How are they different ?
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9. What is the difference between a list and a tuple ?
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10. In the Python shell, do the following :
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11. Discuss the utility and significance of Tuples, briefly.
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13. What is the difference between (30) and (30,) ?
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14. Why is a dictionary termed as an unordered collection of objects ?
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15. What type of objects can be used as keys in dictionaries ?
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16. Though tuples are immutable type, yet they cannot always be used as keys in a dictionary. What is the condition to use tuples as a key in a dictionary ?
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17. Dictionary is a mutable type, which means you can modify its contents ? What all is modifiable in a dictionary ? Can you modify the keys of a dictionary ?
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18. How is del D and del D[] different from one another if D is a dictionary ?
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20. What is sorting ? Name some popular sorting techniques.
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21. Discuss Bubble sort and Insertion sort techniques.
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