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Adding doctests in swap_nodes.py #10455

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26 changes: 24 additions & 2 deletions data_structures/linked_list/swap_nodes.py
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Original file line number Diff line number Diff line change
Expand Up @@ -47,10 +47,32 @@ def swap_nodes(self, node_data_1, node_data_2) -> None:
Args:
node_data_1: Data value of the first node to be swapped.
node_data_2: Data value of the second node to be swapped.


Note:
If either of the specified data values isn't found then, no swapping occurs.
Example 1: Swapping two nodes in the middle of the list
>>> ll = LinkedList()
>>> ll.push(1)
>>> ll.push(2)
>>> ll.push(3)
>>> ll.swap_nodes(2, 3)
>>> ll.print_list()
2 3 1
Example 2: Swapping nodes at the beginning and end of the list
>>> ll = LinkedList()
>>> ll.push(1)
>>> ll.push(2)
>>> ll.push(3)
>>> ll.swap_nodes(1, 3)
>>> ll.print_list()
3 2 1
Example 3: No swapping occurs if one of the data values is not found
>>> ll = LinkedList()
>>> ll.push(1)
>>> ll.push(2)
>>> ll.push(3)
>>> ll.swap_nodes(1, 2)
>>> ll.print_list()
2 1 3
"""
if node_data_1 == node_data_2:
return
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