mirror of
https://github.com/TheAlgorithms/Python.git
synced 2024-11-24 05:21:09 +00:00
[mypy] Add/fix type annotations for binary trees in data structures (#4085)
* fix mypy: data_structures:binary_tree * mypy --strict for binary_trees in data_structures * fix pre-commit Co-authored-by: LiHao <leo_how@163.com>
This commit is contained in:
Hao LI
GitHub
parent
97b6ca2b19
commit
2595cf059d
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@ -8,21 +8,22 @@ To run an example:
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python binary_search_tree_recursive.py
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"""
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import unittest
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from typing import Iterator, Optional
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class Node:
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def __init__(self, label: int, parent):
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def __init__(self, label: int, parent: Optional["Node"]) -> None:
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self.label = label
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self.parent = parent
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self.left = None
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self.right = None
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self.left: Optional[Node] = None
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self.right: Optional[Node] = None
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class BinarySearchTree:
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def __init__(self):
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self.root = None
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def __init__(self) -> None:
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self.root: Optional[Node] = None
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def empty(self):
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def empty(self) -> None:
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"""
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Empties the tree
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@ -46,7 +47,7 @@ class BinarySearchTree:
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"""
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return self.root is None
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def put(self, label: int):
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def put(self, label: int) -> None:
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"""
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Put a new node in the tree
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@ -65,7 +66,9 @@ class BinarySearchTree:
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"""
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self.root = self._put(self.root, label)
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def _put(self, node: Node, label: int, parent: Node = None) -> Node:
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def _put(
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self, node: Optional[Node], label: int, parent: Optional[Node] = None
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) -> Node:
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if node is None:
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node = Node(label, parent)
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else:
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@ -95,7 +98,7 @@ class BinarySearchTree:
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"""
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return self._search(self.root, label)
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def _search(self, node: Node, label: int) -> Node:
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def _search(self, node: Optional[Node], label: int) -> Node:
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if node is None:
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raise Exception(f"Node with label {label} does not exist")
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else:
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@ -106,7 +109,7 @@ class BinarySearchTree:
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return node
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def remove(self, label: int):
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def remove(self, label: int) -> None:
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"""
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Removes a node in the tree
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@ -122,13 +125,7 @@ class BinarySearchTree:
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Exception: Node with label 3 does not exist
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"""
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node = self.search(label)
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if not node.right and not node.left:
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self._reassign_nodes(node, None)
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elif not node.right and node.left:
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self._reassign_nodes(node, node.left)
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elif node.right and not node.left:
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self._reassign_nodes(node, node.right)
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else:
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if node.right and node.left:
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lowest_node = self._get_lowest_node(node.right)
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lowest_node.left = node.left
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lowest_node.right = node.right
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@ -136,8 +133,14 @@ class BinarySearchTree:
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if node.right:
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node.right.parent = lowest_node
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self._reassign_nodes(node, lowest_node)
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elif not node.right and node.left:
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self._reassign_nodes(node, node.left)
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elif node.right and not node.left:
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self._reassign_nodes(node, node.right)
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else:
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self._reassign_nodes(node, None)
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def _reassign_nodes(self, node: Node, new_children: Node):
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def _reassign_nodes(self, node: Node, new_children: Optional[Node]) -> None:
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if new_children:
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new_children.parent = node.parent
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@ -192,7 +195,7 @@ class BinarySearchTree:
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>>> t.get_max_label()
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10
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"""
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if self.is_empty():
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if self.root is None:
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raise Exception("Binary search tree is empty")
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node = self.root
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@ -216,7 +219,7 @@ class BinarySearchTree:
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>>> t.get_min_label()
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8
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"""
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if self.is_empty():
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if self.root is None:
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raise Exception("Binary search tree is empty")
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node = self.root
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@ -225,7 +228,7 @@ class BinarySearchTree:
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return node.label
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def inorder_traversal(self) -> list:
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def inorder_traversal(self) -> Iterator[Node]:
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"""
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Return the inorder traversal of the tree
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@ -241,13 +244,13 @@ class BinarySearchTree:
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"""
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return self._inorder_traversal(self.root)
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def _inorder_traversal(self, node: Node) -> list:
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def _inorder_traversal(self, node: Optional[Node]) -> Iterator[Node]:
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if node is not None:
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yield from self._inorder_traversal(node.left)
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yield node
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yield from self._inorder_traversal(node.right)
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def preorder_traversal(self) -> list:
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def preorder_traversal(self) -> Iterator[Node]:
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"""
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Return the preorder traversal of the tree
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@ -263,7 +266,7 @@ class BinarySearchTree:
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"""
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return self._preorder_traversal(self.root)
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def _preorder_traversal(self, node: Node) -> list:
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def _preorder_traversal(self, node: Optional[Node]) -> Iterator[Node]:
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if node is not None:
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yield node
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yield from self._preorder_traversal(node.left)
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@ -272,7 +275,7 @@ class BinarySearchTree:
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class BinarySearchTreeTest(unittest.TestCase):
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@staticmethod
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def _get_binary_search_tree():
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def _get_binary_search_tree() -> BinarySearchTree:
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r"""
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8
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/ \
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@ -298,7 +301,7 @@ class BinarySearchTreeTest(unittest.TestCase):
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return t
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def test_put(self):
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def test_put(self) -> None:
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t = BinarySearchTree()
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assert t.is_empty()
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@ -306,6 +309,7 @@ class BinarySearchTreeTest(unittest.TestCase):
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r"""
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8
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"""
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assert t.root is not None
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assert t.root.parent is None
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assert t.root.label == 8
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@ -315,6 +319,7 @@ class BinarySearchTreeTest(unittest.TestCase):
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\
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10
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"""
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assert t.root.right is not None
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assert t.root.right.parent == t.root
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assert t.root.right.label == 10
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@ -324,6 +329,7 @@ class BinarySearchTreeTest(unittest.TestCase):
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/ \
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3 10
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"""
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assert t.root.left is not None
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assert t.root.left.parent == t.root
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assert t.root.left.label == 3
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@ -335,6 +341,7 @@ class BinarySearchTreeTest(unittest.TestCase):
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\
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6
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"""
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assert t.root.left.right is not None
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assert t.root.left.right.parent == t.root.left
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assert t.root.left.right.label == 6
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@ -346,13 +353,14 @@ class BinarySearchTreeTest(unittest.TestCase):
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/ \
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1 6
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"""
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assert t.root.left.left is not None
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assert t.root.left.left.parent == t.root.left
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assert t.root.left.left.label == 1
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with self.assertRaises(Exception):
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t.put(1)
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def test_search(self):
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def test_search(self) -> None:
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t = self._get_binary_search_tree()
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node = t.search(6)
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@ -364,7 +372,7 @@ class BinarySearchTreeTest(unittest.TestCase):
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with self.assertRaises(Exception):
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t.search(2)
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def test_remove(self):
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def test_remove(self) -> None:
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t = self._get_binary_search_tree()
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t.remove(13)
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@ -379,6 +387,9 @@ class BinarySearchTreeTest(unittest.TestCase):
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\
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5
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"""
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assert t.root is not None
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assert t.root.right is not None
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assert t.root.right.right is not None
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assert t.root.right.right.right is None
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assert t.root.right.right.left is None
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@ -394,6 +405,9 @@ class BinarySearchTreeTest(unittest.TestCase):
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\
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5
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"""
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assert t.root.left is not None
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assert t.root.left.right is not None
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assert t.root.left.right.left is not None
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assert t.root.left.right.right is None
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assert t.root.left.right.left.label == 4
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@ -407,6 +421,8 @@ class BinarySearchTreeTest(unittest.TestCase):
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\
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5
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"""
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assert t.root.left.left is not None
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assert t.root.left.right.right is not None
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assert t.root.left.left.label == 1
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assert t.root.left.right.label == 4
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assert t.root.left.right.right.label == 5
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@ -422,6 +438,7 @@ class BinarySearchTreeTest(unittest.TestCase):
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/ \ \
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1 5 14
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"""
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assert t.root is not None
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assert t.root.left.label == 4
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assert t.root.left.right.label == 5
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assert t.root.left.left.label == 1
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@ -437,13 +454,15 @@ class BinarySearchTreeTest(unittest.TestCase):
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/ \
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1 14
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"""
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assert t.root.left is not None
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assert t.root.left.left is not None
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assert t.root.left.label == 5
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assert t.root.left.right is None
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assert t.root.left.left.label == 1
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assert t.root.left.parent == t.root
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assert t.root.left.left.parent == t.root.left
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def test_remove_2(self):
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def test_remove_2(self) -> None:
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t = self._get_binary_search_tree()
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t.remove(3)
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@ -456,6 +475,12 @@ class BinarySearchTreeTest(unittest.TestCase):
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/ \ /
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5 7 13
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"""
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assert t.root is not None
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assert t.root.left is not None
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assert t.root.left.left is not None
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assert t.root.left.right is not None
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assert t.root.left.right.left is not None
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assert t.root.left.right.right is not None
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assert t.root.left.label == 4
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assert t.root.left.right.label == 6
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assert t.root.left.left.label == 1
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@ -466,25 +491,25 @@ class BinarySearchTreeTest(unittest.TestCase):
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assert t.root.left.left.parent == t.root.left
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assert t.root.left.right.left.parent == t.root.left.right
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def test_empty(self):
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def test_empty(self) -> None:
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t = self._get_binary_search_tree()
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t.empty()
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assert t.root is None
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def test_is_empty(self):
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def test_is_empty(self) -> None:
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t = self._get_binary_search_tree()
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assert not t.is_empty()
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t.empty()
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assert t.is_empty()
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def test_exists(self):
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def test_exists(self) -> None:
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t = self._get_binary_search_tree()
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assert t.exists(6)
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assert not t.exists(-1)
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def test_get_max_label(self):
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def test_get_max_label(self) -> None:
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t = self._get_binary_search_tree()
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assert t.get_max_label() == 14
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@ -493,7 +518,7 @@ class BinarySearchTreeTest(unittest.TestCase):
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with self.assertRaises(Exception):
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t.get_max_label()
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def test_get_min_label(self):
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def test_get_min_label(self) -> None:
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t = self._get_binary_search_tree()
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assert t.get_min_label() == 1
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@ -502,20 +527,20 @@ class BinarySearchTreeTest(unittest.TestCase):
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with self.assertRaises(Exception):
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t.get_min_label()
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def test_inorder_traversal(self):
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def test_inorder_traversal(self) -> None:
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t = self._get_binary_search_tree()
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inorder_traversal_nodes = [i.label for i in t.inorder_traversal()]
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assert inorder_traversal_nodes == [1, 3, 4, 5, 6, 7, 8, 10, 13, 14]
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def test_preorder_traversal(self):
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def test_preorder_traversal(self) -> None:
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t = self._get_binary_search_tree()
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preorder_traversal_nodes = [i.label for i in t.preorder_traversal()]
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assert preorder_traversal_nodes == [8, 3, 1, 6, 4, 5, 7, 10, 14, 13]
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def binary_search_tree_example():
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def binary_search_tree_example() -> None:
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r"""
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Example
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8
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@ -1,6 +1,7 @@
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from __future__ import annotations
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import math
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from typing import List, Union
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class SegmentTree:
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@ -37,7 +38,7 @@ class SegmentTree:
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return idx * 2 + 1
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def build(
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self, idx: int, left_element: int, right_element: int, A: list[int]
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self, idx: int, left_element: int, right_element: int, A: List[int]
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) -> None:
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if left_element == right_element:
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self.segment_tree[idx] = A[left_element - 1]
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@ -88,7 +89,7 @@ class SegmentTree:
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# query with O(lg n)
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def query(
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self, idx: int, left_element: int, right_element: int, a: int, b: int
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) -> int:
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) -> Union[int, float]:
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"""
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query(1, 1, size, a, b) for query max of [a,b]
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>>> A = [1, 2, -4, 7, 3, -5, 6, 11, -20, 9, 14, 15, 5, 2, -8]
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@ -118,8 +119,8 @@ class SegmentTree:
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q2 = self.query(self.right(idx), mid + 1, right_element, a, b)
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return max(q1, q2)
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def __str__(self) -> None:
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return [self.query(1, 1, self.size, i, i) for i in range(1, self.size + 1)]
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def __str__(self) -> str:
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return str([self.query(1, 1, self.size, i, i) for i in range(1, self.size + 1)])
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if __name__ == "__main__":
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@ -3,6 +3,7 @@
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from __future__ import annotations
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from random import random
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from typing import Optional, Tuple
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class Node:
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@ -11,13 +12,13 @@ class Node:
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Treap is a binary tree by value and heap by priority
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"""
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def __init__(self, value: int = None):
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def __init__(self, value: Optional[int] = None):
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self.value = value
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self.prior = random()
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self.left = None
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self.right = None
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self.left: Optional[Node] = None
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self.right: Optional[Node] = None
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def __repr__(self):
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def __repr__(self) -> str:
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from pprint import pformat
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if self.left is None and self.right is None:
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@ -27,14 +28,14 @@ class Node:
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{f"{self.value}: {self.prior:.5}": (self.left, self.right)}, indent=1
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)
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def __str__(self):
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def __str__(self) -> str:
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value = str(self.value) + " "
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left = str(self.left or "")
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right = str(self.right or "")
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return value + left + right
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def split(root: Node, value: int) -> tuple[Node, Node]:
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def split(root: Optional[Node], value: int) -> Tuple[Optional[Node], Optional[Node]]:
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"""
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We split current tree into 2 trees with value:
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@ -42,9 +43,9 @@ def split(root: Node, value: int) -> tuple[Node, Node]:
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Right tree contains all values greater or equal, than split value
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"""
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if root is None: # None tree is split into 2 Nones
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return (None, None)
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return None, None
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elif root.value is None:
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return (None, None)
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return None, None
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else:
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if value < root.value:
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"""
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@ -54,16 +55,16 @@ def split(root: Node, value: int) -> tuple[Node, Node]:
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Right tree's left son: right part of that split
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"""
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left, root.left = split(root.left, value)
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return (left, root)
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return left, root
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else:
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"""
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Just symmetric to previous case
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"""
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root.right, right = split(root.right, value)
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return (root, right)
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return root, right
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def merge(left: Node, right: Node) -> Node:
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def merge(left: Optional[Node], right: Optional[Node]) -> Optional[Node]:
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"""
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We merge 2 trees into one.
|
||||
Note: all left tree's values must be less than all right tree's
|
||||
|
|
@ -85,7 +86,7 @@ def merge(left: Node, right: Node) -> Node:
|
|||
return right
|
||||
|
||||
|
||||
def insert(root: Node, value: int) -> Node:
|
||||
def insert(root: Optional[Node], value: int) -> Optional[Node]:
|
||||
"""
|
||||
Insert element
|
||||
|
||||
|
|
@ -98,7 +99,7 @@ def insert(root: Node, value: int) -> Node:
|
|||
return merge(merge(left, node), right)
|
||||
|
||||
|
||||
def erase(root: Node, value: int) -> Node:
|
||||
def erase(root: Optional[Node], value: int) -> Optional[Node]:
|
||||
"""
|
||||
Erase element
|
||||
|
||||
|
|
@ -111,7 +112,7 @@ def erase(root: Node, value: int) -> Node:
|
|||
return merge(left, right)
|
||||
|
||||
|
||||
def inorder(root: Node):
|
||||
def inorder(root: Optional[Node]) -> None:
|
||||
"""
|
||||
Just recursive print of a tree
|
||||
"""
|
||||
|
|
@ -123,7 +124,7 @@ def inorder(root: Node):
|
|||
inorder(root.right)
|
||||
|
||||
|
||||
def interactTreap(root, args):
|
||||
def interactTreap(root: Optional[Node], args: str) -> Optional[Node]:
|
||||
"""
|
||||
Commands:
|
||||
+ value to add value into treap
|
||||
|
|
@ -160,7 +161,7 @@ def interactTreap(root, args):
|
|||
return root
|
||||
|
||||
|
||||
def main():
|
||||
def main() -> None:
|
||||
"""After each command, program prints treap"""
|
||||
root = None
|
||||
print(
|
||||
|
|
|
|||
Loading…
Reference in New Issue
Block a user