Question

Write a Python function fun3(e) to update a list of numbers e such that the first and last elements have been exchanged. The function needs to also return multiplication of elements of e. You should assume that the list e has at least 2 elements.

Example:

>>>lst = [4, 1, 2, -1]

>>>fun3(list)

-8

Answer 1

Answer:

Here is code in Python:

#function to swap first and last element of the list

#and calculate product of all elements of list

def fun3(e):

   product = 1

   temp = e[0]

   e[0] = e[-1]

   e[-1] = temp

   for a in e:

       product *= a

   return product

#create a list

inp_lst = [4, 1, 2, -1]

#call the fun3() with parameter inp_lst

print("product of all elements of list is: ",fun3(inp_lst))

#print the list after swapping

print("list after swapping first and last element: ",inp_lst)

Explanation:

Create a list "inp_lst" and initialize it with [4,1,2,-1]. In the function fun3() pass a list parameter "e". create a variable "product" to calculate the product of all elements.Also create a temporary variable to swap the first and last element of the list.

Output:

product of all elements of list is:  -8                                                                                        

list after swaping first and last element:  [-1, 1, 2, 4]