Question

Read a list of n elements. Pass this list to a function which reverses this list in-place without creating a new list.

Answer 1

Program:

def reverseList():

global list1

#Using reverse() function to reverse the list in place

#This will not create any new list

list1.reverse()

print("Reversed List:",list1)

#Defining empty list

list1 = list()

#Getting input for number of elements to be added in the list

inp = int(input("How many elements do you want to add in the list? "))

#Taking the input from user

for i in range(inp):

a = int(input("Enter the elements: "))

list1.append(a)

#Printing the list

print("The list entered is:",list1)

#The function reverseList is called to reverse the list

reverseList()
​
OUTPUT:

How many elements do you want to add in the list? 6

Enter the elements: 1

Enter the elements: 2

Enter the elements: 4

Enter the elements: 5

Enter the elements: 9

Enter the elements: 3

The list entered is: [1, 2, 4, 5, 9, 3]

Reversed List: [3, 9, 5, 4, 2, 1]