Python-Quizzes | Python List Quiz | Question 23

Find the output of the following program: 

Python3

L1 = [1, 2, 3, 4]
L2 = L1
L3 = L1.copy()
L4 = L1
L1[0] = [5]
print(L1, L2, L3, L4)

(A)

[5, 2, 3, 4] [5, 2, 3, 4] [1, 2, 3, 4] [1, 2, 3, 4]

(B)

[[5], 2, 3, 4] [[5], 2, 3, 4] [[5], 2, 3, 4] [1, 2, 3, 4]

(C)

[5, 2, 3, 4] [5, 2, 3, 4] [5, 2, 3, 4] [1, 2, 3, 4]

(D)

[[5], 2, 3, 4] [[5], 2, 3, 4] [1, 2, 3, 4] [[5], 2, 3, 4]

Answer: (D)
Explanation:

List L2 is the Shallow copy of L1, while L3 and L4 are Deep Copy(True Copy) of List L1. L1[0] = [5], implies that at index 0, list [5] will be present and not integer value 5.

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