Python Revision Tour II — Question 5

[4, 3, 2]

The slicing notation a[start:stop:step] extracts a portion of the list from index start to stop-1 with a specified step. In the slicing part a[3:0:-1]:

• start is 3, which corresponds to the element with value 4.
• stop is 0, but as element at stop index is excluded so slicing goes up to index 1.
• step is -1, indicating that we want to step backward through the list.

Putting it together:

a[3:0:-1]

This extracts elements from index 3 to (0+1) in reverse order with a step of -1.

The output of the code will be:

[4, 3, 2]