# Python Questions and Answers – Lists – 2

This set of Python Coding Questions & Answers focuses on “Lists”.

1. What will be the output of the following Python code?

1. `>>>names = ['Amir', 'Bear', 'Charlton', 'Daman']`
2. `>>>print(names[-1][-1])`

a) A
b) Daman
c) Error
d) n

Explanation: Execute in the shell to verify.

2. What will be the output of the following Python code?

1. `names1 = ['Amir', 'Bear', 'Charlton', 'Daman']`
2. `names2 = names1`
3. `names3 = names1[:]`
4. ` `
5. `names2[0] = 'Alice'`
6. `names3[1] = 'Bob'`
7. ` `
8. `sum = 0`
9. `for ls in (names1, names2, names3):`
10. `    if ls[0] == 'Alice':`
11. `        sum += 1`
12. `    if ls[1] == 'Bob':`
13. `        sum += 10`
14. ` `
15. `print sum`

a) 11
b) 12
c) 21
d) 22

Explanation: When assigning names1 to names2, we create a second reference to the same list. Changes to names2 affect names1. When assigning the slice of all elements in names1 to names3, we are creating a full copy of names1 which can be modified independently.

3. Suppose list1 is [1, 3, 2], What is list1 * 2?
a) [2, 6, 4]
b) [1, 3, 2, 1, 3]
c) [1, 3, 2, 1, 3, 2]
d) [1, 3, 2, 3, 2, 1]

Explanation: Execute in the shell and verify.

4. Suppose list1 = [0.5 * x for x in range(0, 4)], list1 is:
a) [0, 1, 2, 3]
b) [0, 1, 2, 3, 4]
c) [0.0, 0.5, 1.0, 1.5]
d) [0.0, 0.5, 1.0, 1.5, 2.0]

Explanation: Execute in the shell to verify.

5. What will be the output of the following Python code?

1. `>>>list1 = [11, 2, 23]`
2. `>>>list2 = [11, 2, 2]`
3. `>>>list1 < list2`

a) True
b) False
c) Error
d) None

Explanation: Elements are compared one by one.

6. To add a new element to a list we use which command?
b) list1.append(5)

Explanation: We use the function append to add an element to the list.

7. To insert 5 to the third position in list1, we use which command?
a) list1.insert(3, 5)
b) list1.insert(2, 5)
d) list1.append(3, 5)

Explanation: Execute in the shell to verify.

8. To remove string “hello” from list1, we use which command?
a) list1.remove(“hello”)
b) list1.remove(hello)
c) list1.removeAll(“hello”)
d) list1.removeOne(“hello”)

Explanation: Execute in the shell to verify.

9. Suppose list1 is [3, 4, 5, 20, 5], what is list1.index(5)?
a) 0
b) 1
c) 4
d) 2

Explanation: Execute help(list.index) to get details.

10. Suppose list1 is [3, 4, 5, 20, 5, 25, 1, 3], what is list1.count(5)?
a) 0
b) 4
c) 1
d) 2

Explanation: Execute in the shell to verify.

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