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Added doctest to binary_search_tree.py #11144

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Added doctest to binary_search_tree.py #11144

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42 changes: 42 additions & 0 deletions data_structures/binary_tree/binary_search_tree.py
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Original file line number Diff line number Diff line change
Expand Up @@ -198,6 +198,30 @@ def insert(self, *values) -> Self:
return self

def search(self, value) -> Node | None:
"""
>>> bst = BinarySearchTree().insert(10,20,30,40,50)
>>> bst.search(10)
{'10': (None, {'20': (None, {'30': (None, {'40': (None, 50)})})})}
>>> bst.search(20)
{'20': (None, {'30': (None, {'40': (None, 50)})})}
>>> bst.search(30)
{'30': (None, {'40': (None, 50)})}
>>> bst.search(40)
{'40': (None, 50)}
>>> bst.search(50)
50
>>> bst.search(0) # element not present

>>> bst.search(-5 ) # element not present

>>> bst.search(5) # element not present

>>> bst= BinarySearchTree().search(10)
Traceback (most recent call last):
...
IndexError: Warning: Tree is empty! please use another.
"""

if self.empty():
raise IndexError("Warning: Tree is empty! please use another.")
else:
Expand All @@ -210,6 +234,15 @@ def search(self, value) -> Node | None:
def get_max(self, node: Node | None = None) -> Node | None:
"""
We go deep on the right branch

>>> BinarySearchTree().insert(10,20,30,40,50).get_max()
50
>>> BinarySearchTree().insert(-5,-1,0,-0.3,-4.5).get_max()
{'0': (-0.3, None)}
>>> BinarySearchTree().insert(1,78.3,30,74.0,1).get_max()
{'78.3': ({'30': (1, 74.0)}, None)}
>>> BinarySearchTree().insert(1,783,30,740,1).get_max()
{'783': ({'30': (1, 740)}, None)}
"""
if node is None:
if self.root is None:
Expand All @@ -224,6 +257,15 @@ def get_max(self, node: Node | None = None) -> Node | None:
def get_min(self, node: Node | None = None) -> Node | None:
"""
We go deep on the left branch

>>> BinarySearchTree().insert(10,20,30,40,50).get_min()
{'10': (None, {'20': (None, {'30': (None, {'40': (None, 50)})})})}
>>> BinarySearchTree().insert(-5,-1,0,-0.3,-4.5).get_min()
{'-5': (None, {'-1': (-4.5, {'0': (-0.3, None)})})}
>>> BinarySearchTree().insert(1,78.3,30,74.0,1).get_min()
{'1': (None, {'78.3': ({'30': (1, 74.0)}, None)})}
>>> BinarySearchTree().insert(1,783,30,740,1).get_min()
{'1': (None, {'783': ({'30': (1, 740)}, None)})}
"""
if node is None:
node = self.root
Expand Down