The function swap_list_ends in python takes one parameter, L, which is a list. The function then swaps the first and last items in L and returns the object None. Notice that since L is mutable, the changes the function makes to L are visible back in the calling program.SPECIAL CASE: If the list 'L' is empty, then the function does nothing to L and returns None.For example:TestResultL = [1, 3, 9, 2] if not(swap_list_ends(L) is None): print("Error: function should return None") print(L)[2, 3, 9, 1]L = ['super', 'awesome', 'excellent'] if not(swap_list_ends(L) is None): print("Error: function should return None") print(L)['excellent', 'awesome', 'super']L = [True, False] if not(swap_list_ends(L) is None): print("Error: function should return None") print(L)[False, True]

Description: Define a function swap_list_ends that takes a list L as an input parameter: Find the…

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Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

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The function swap_list_ends in python takes one parameter, L, which is a list. The function then swaps the first and last items in L and returns the object None. Notice that since L is mutable, the changes the function makes to L are visible back in the calling program.

SPECIAL CASE: If the list 'L' is empty, then the function does nothing to L and returns None.

For example:

Test	Result
L = [1, 3, 9, 2] if not(swap_list_ends(L) is None): print("Error: function should return None") print(L)	[2, 3, 9, 1]
L = ['super', 'awesome', 'excellent'] if not(swap_list_ends(L) is None): print("Error: function should return None") print(L)	['excellent', 'awesome', 'super']
L = [True, False] if not(swap_list_ends(L) is None): print("Error: function should return None") print(L)	[False, True]

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