Thursday 11 April 2024

Python Coding challenge - Day 171 | What is the output of the following Python Code?

 

Let's break down the code:

list1 = [0, 1, 2, 3]

list2 = list1[1::-1]

print(list2)

list1 = [0, 1, 2, 3]: This line initializes a list list1 with elements [0, 1, 2, 3].

list2 = list1[1::-1]: Here, list1[1::-1] is using list slicing to create a new list list2. Let's break down the slicing expression:

1: This is the start index of the slice. It starts from index 1, which is the second element in list1.

::-1: This specifies the step value for the slice. In this case, -1 means to step backward through the list.

So, list1[1::-1] starts from index 1 (the second element) and goes backward to the beginning of the list.

When slicing backward ([::-1]), it reverses the order of elements. So, list2 will contain elements from index 1 (inclusive) to the beginning of the list (inclusive), in reverse order.

print(list2): This line prints the contents of list2.

Now, let's evaluate list2 based on the slicing operation:

list1[1::-1] starts from index 1, which is 1, and includes the element at that index.

The step -1 means it goes backward.

So, it goes from index 1 (1) to the beginning of the list (0) in reverse order.

As a result, list2 will contain [1, 0].

Therefore, the output of print(list2) will be:

[1, 0]

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