Question

1/ What results would be appear on the computer screen after the print statements in the following Python code? Explain what is happening in lines 4-6.

1. animals = ["cat", "dog", "elephant", "fox", ["mouse", "bird", "beetle"]]
2. newlist = animals
3. print( newlist)
4. newlist[4][0] = ["caterpillar", "butterfly"]
5. print(newlist)
6. print(animals)

2/ What is the result of the following Python statements:

1. print( animals[2:4])                    

2. print(animals[-3] )

output = "fox"

Answer 1

1.

Animals =["cat", "Dog","Elephant","fox,["mouse","bird","beetle"]]

Here Animals is a nested list having another list at index 4.

Let us see index of all the elements of the list animals

Animals[0] = "Cat"

Animals[1] = "dog"

Animals[2] = "elephant"

Animals[3] = " fox"

Animals[4][0] = "mouse"

Animals[4][1] ="bird"

Animals[4][2] = "beetle"

// Further we are copying our list:Animals to a new list:Newlist //

In the line 4 ....

Newlist[4][0] = ["caterpillar","butterfly"]

// .......... Here we are modifing the existing element of Newlist at the index [4][0] which was mouse

So now the index of the elements are

Newlist [4][0][0] = " caterpillar "

Newlist[4][0][1] = " butterfly " ...........//

Print(newlist) // displaying all the elements of Newlist //

Print(animals) // displaying all the elements of animals //

2.

Print(Animals[2:4])

// .........it defines and then display the range of the index of the elements which the user wants to display , including the element of 2nd element and excluding the 4th element ] .......//

Output = [ "Elephant " , "fox"]

Print (Animals [-3])

//....... It displays the third last element of the list Animal .....//

So it displays fox

Output = ["fox"]