mirror of
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dfdd78135d
* updating DIRECTORY.md
* Fix mypy errors in circular_linked_list.py
* Fix mypy errors in swap_nodes.py
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Co-authored-by: github-actions <${GITHUB_ACTOR}@users.noreply.github.com>
85 lines
2.3 KiB
Python
85 lines
2.3 KiB
Python
from typing import Any
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class Node:
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def __init__(self, data: Any) -> None:
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"""
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Initialize a new Node with the given data.
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Args:
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data: The data to be stored in the node.
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"""
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self.data = data
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self.next: Node | None = None # Reference to the next node
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class LinkedList:
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def __init__(self) -> None:
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"""
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Initialize an empty Linked List.
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"""
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self.head: Node | None = None # Reference to the head (first node)
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def print_list(self):
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"""
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Print the elements of the Linked List in order.
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"""
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temp = self.head
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while temp is not None:
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print(temp.data, end=" ")
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temp = temp.next
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print()
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def push(self, new_data: Any) -> None:
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"""
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Add a new node with the given data to the beginning of the Linked List.
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Args:
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new_data (Any): The data to be added to the new node.
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"""
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new_node = Node(new_data)
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new_node.next = self.head
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self.head = new_node
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def swap_nodes(self, node_data_1, node_data_2) -> None:
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"""
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Swap the positions of two nodes in the Linked List based on their data values.
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Args:
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node_data_1: Data value of the first node to be swapped.
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node_data_2: Data value of the second node to be swapped.
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Note:
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If either of the specified data values isn't found then, no swapping occurs.
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"""
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if node_data_1 == node_data_2:
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return
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else:
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node_1 = self.head
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while node_1 is not None and node_1.data != node_data_1:
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node_1 = node_1.next
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node_2 = self.head
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while node_2 is not None and node_2.data != node_data_2:
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node_2 = node_2.next
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if node_1 is None or node_2 is None:
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return
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# Swap the data values of the two nodes
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node_1.data, node_2.data = node_2.data, node_1.data
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if __name__ == "__main__":
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ll = LinkedList()
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for i in range(5, 0, -1):
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ll.push(i)
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print("Original Linked List:")
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ll.print_list()
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ll.swap_nodes(1, 4)
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print("After swapping the nodes whose data is 1 and 4:")
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ll.print_list()
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