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DSA SERIES CHAPTER 17 : CREATION OF BINARY TREE (PYTHON VERSION)
1. Objective
This post explains how to create a Binary Tree in Python using:
Class-based node representation
Object references instead of pointers
Manual linking of nodes
This is the Python equivalent of pointer-based creation in C.
2. Binary Tree Diagram Used (Same as C Version)
1
/ \
2 3
/ \
4 5
3. What Does “Creating a Binary Tree” Mean in Python?
Definition
Creating a binary tree in Python means defining a node class and linking node objects using left and right references to form a hierarchical structure.
Important clarification:
This is NOT insertion logic
Tree shape is explicitly defined
4. Node Class in Python
class Node:
def __init__(self, data):
self.data = data
self.left = None
self.right = None
Explanation
data→ stores node valueleft→ reference to left childright→ reference to right childPython automatically handles memory allocation
5. Full Python Program – Binary Tree Creation
class Node:
def __init__(self, data):
self.data = data
self.left = None
self.right = None
# Step 1: Create root node
root = Node(1)
# Step 2: Create left and right children of root
root.left = Node(2)
root.right = Node(3)
# Step 3: Create children of node 2
root.left.left = Node(4)
root.left.right = Node(5)
print("Binary Tree created successfully")
6. Step-by-Step Creation Explanation
Node(1)→ root node createdNode(2)linked as left child of rootNode(3)linked as right child of rootNode(4)linked as left child of node2Node(5)linked as right child of node2
Tree structure now exactly matches the diagram.
7. Conceptual Memory Representation
root
|
Node(1)
/ \
Node(2) Node(3)
/ \
Node(4) Node(5)
Each node is a separate object, connected via references.
8. Time and Space Complexity
Time Complexity
O(n) — number of nodes created
Space Complexity
O(n) — memory for n node objects
9. Difference Between C and Python Creation (Important)
| Aspect | C | Python |
|---|---|---|
| Memory allocation | malloc() | Automatic |
| Linking | Pointers | Object references |
| Deallocation | Manual (free) | Garbage collection |
10. Common Student Mistakes
Forgetting to initialize
leftandrightasNoneAssuming Python automatically creates children
Confusing tree creation with insertion logic
11. Practice Questions
Create a right-skewed binary tree in Python.
Modify the tree to add one more level.
Draw object reference diagram for the tree.
What happens if
leftorrightis not initialized?
12. Learning Outcome
After this post, a student can:
Define a binary tree node class
Create any binary tree structure manually
Relate Python references to C pointers
Prepare for insertion and traversal logic
ALSO CHECK
ALSO CHECK
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