from copy import deepcopyclass List:||||||Implements an array-based List ADT.|| || ||def pair_swap (self):ILILILPerforms a pairwise swap on all nodes in source.Use: source.pair_swap()Returns:NoneExamples:|| || ||[1,2,3,4] -> [2,1,4,3][1,2,3,4,5] → [2,1,4,3,5]#your code herereturn

Answered: 9 from copy import deepcopy class List:…

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

Problem 1PE

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Question

from copy import deepcopy
class List:
||||||
Implements an array-based List ADT.
|| || ||
def pair_swap (self):
ILILIL
Performs a pairwise swap on all nodes in source.
Use: source.pair_swap()
Returns:
None
Examples:
|| || ||
[1,2,3,4] -> [2,1,4,3]
[1,2,3,4,5] → [2,1,4,3,5]
#your code here
return

Expert Solution

Step 1: code

1from copy import deepcopy
2
3class List:
4    def __init__(self, items):
5        self.items = items
6
7    def pair_swap(self):
8        if len(self.items) % 2 == 0:
9            for i in range(0, len(self.items), 2):
10                self.items[i], self.items[i + 1] = self.items[i + 1], self.items[i]
11        else:
12            # If the list has an odd number of elements, swap all but the last element
13            for i in range(0, len(self.items) - 1, 2):
14                self.items[i], self.items[i + 1] = self.items[i + 1], self.items[i]
15
16    def __str__(self):
17        return str(self.items)
18
19# Examples
20my_list = List([1, 2, 3, 4])
21my_list.pair_swap()
22print(my_list)  # Output: [2, 1, 4, 3]
23
24my_list2 = List([1, 2, 3, 4, 5])
25my_list2.pair_swap()
26print(my_list2)  # Output: [2, 1, 4, 3, 5]
27

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