Class 12 CS Chapter 2 Python Revision Tour II Solutions Sumita Arora New Syllabus

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Back Exercise Part A

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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Back Exercise Part B

Back Exercise Part C

1. Write a program that prompts for a phone number of 10 digits and two dashes, with dashes after the area code and the next three numbers. For example, 017-555-1212 is a legal input. Display if the phone number entered is valid format or not and display if the phone number is valid or not (i.e., contains just the digits and dash at specific places).
3. Write a program that takes any two lists L and M of the same size and adds their elements together to form a new list N whose elements are sums of the corresponding elements in L and M. For instance, if L = [3,1,4] and M = [1, 5,9], then N should equal [4, 6, 13].
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3. Write a program that should prompt the user to type some sentence(s) followed by “enter”. It should then print the original sentence(s) and the following statistics relating to the sentence(s) :
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2. Write a program that should prompt the user to type some sentence(s) followed by “enter”. It should then print the original sentence(s) and the following statistics relating to the sentence(s) :
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4. Write a program that rotates the elements of a list so that the element at the first index moves to the second index, the element in the second index moves to the third index, etc., and the element in the last index moves to the first index.
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5. Write a short Python code segment that prints the longest word in a list of words.
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6. Write a program that creates a list of all the integers less than 100 that are multiples of 3 or 5.
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7. Define two variables first and second so that first = “Jimmy” and second = “Johny”. Write a short Python code segment that swaps the values assigned to these two variables and prints the results.
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8. Write a Python program that creates a tuple storing first 9 terms of Fibonacci series.
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9. Create a dictionary whose keys are month names, and whose values are the number of days in the corresponding months.
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10. Write a function called addDict(dict1, dict2) which computes the union of two dictionaries. It should return a new dictionary, with all the items in both its arguments (assumed to be dictionaries). If the same key appears in both arguments, feel free to pick a value from either.
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11. Write a program to sort a dictionary’s keys using Bubble sort and produce the sorted keys as a list.
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12. Write a program to sort a dictionary’s values using Bubble sort and produce the sorted values as a list.
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