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NPTEL The Joy of Computing using Python Assignment Answers Week 5
Q1. What is the correct way to initialize a dictionary?
a. D = {a-10, b-20, c-30}
b. D = {‘a’-10, ‘b’-20, ‘c’-30}
c. D = {a:10, b:20, c:30}
d. D = {‘a’:10, ‘b’:20, ‘c’:30}
Answer: d. D = {‘a’:10, ‘b’:20, ‘c’:30}
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Q2. What is the correct syntax to get all the keys only from a dictionary d?
a. d.key()
b. d.item()
c. d.value()
d. d.keys()
Answer: d. d.keys()
Q3. Which of the following statements are true about dictionaries in python?
a. The keys of a dictionary must be unique values.
b. The keys of a dictionary can or cannot be unique.
c. The values of a dictionary must be unique values.
d. The values of a dictionary can or cannot be unique.
Answer: a. The keys of a dictionary must be unique values.
d. The values of a dictionary can or cannot be unique.
Q4. State True or False: In the monte hall problem, swapping the choice does not increase the chance of winning.
a. True
b. False
Answer: b. False
Q5. In dictionaries, d.items() will return _
a. Pairs of all (key, value) together.
b. All (keys) and (values) separately.
c. All (values) and (keys) separately.
d. Pairs of all (value, key) together.
Answer: a. Pairs of all (key, value) together.
Q6. What will be the output of the following program?
import string
import random
a = string.ascii_lowercase
d = {}
for i in range(26):
index = random.randint(0, 25)
try:
d[a[index]]+=1
except KeyError:
d[a[index]] = 0
print(d)a. A dictionary with all letters as keys and 0 as values.
b. A dictionary with some letters as keys and 0 as values.
c. A dictionary with all letters as keys and some random numbers as values.
d. A dictionary with some letters as keys and some random numbers as values.
Answer: d. A dictionary with some letters as keys and some random numbers as values.
Q7. Binary search can be applied on ___.
a. Sorted list in ascending order.
b. Unsorted list
c. Both A and B
d. Sorted list in descending order
Answer: a. Sorted list in ascending order.
d. Sorted list in descending order
Q8. Which error is encountered while accessing a position that is not present in a list?
a. KeyError
b. IndexError
c. RunTimeError
d. ValueError
Answer: b. IndexError
Q9. Which of the following command is correct to delete a key from a dictionary ‘d’?
a. d.pop(‘key’)
b. d.del(‘key’)
c. d.remove(‘key’)
d. d.delete(‘key’)
Answer: a. d.pop(‘key’)
Q10. Which of the following is/are correct regarding dictionaries?
i. One can make a dictionary inside a dictionary in python.
ii. Keys in the dictionary are mutable.
a. Option 1 is correct, option 2 is correct. Option 2 is the correct explanation for option 1.
b. Option 1 is correct, option 2 is incorrect. Option 2 is not the correct explanation for option 1.
c. Option 1 is correct, option 2 is correct. Option 2 is not the correct explanation for option 1.
d. None of these
Answer: b. Option 1 is correct, option 2 is incorrect. Option 2 is not the correct explanation for option 1.
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