PythonAlchemist

Transforming complex Python concepts into simple, actionable knowledge. Master Python, AI/ML, and ace your coding interviews.

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AILLM

MCP Explained: The Universal Protocol for AI Tools

What is Model Context Protocol? Watch MCP client-server communication in action. Learn how this Anthropic standard connects LLMs to databases, APIs, and tools.

11 min read

AILLM

AI Agents Explained: From Chatbots to Autonomous Systems

How do AI agents work? Watch the Observe-Think-Act loop in action with our interactive visualizer. Understand ReAct, tool use, and autonomous decision-making.

10 min read

AILLM

RAG Explained: How AI Gets Real-Time Knowledge

What is RAG? Watch the retrieval-augmented generation pipeline step-by-step. See how LLMs access external knowledge through vector search and embeddings.

9 min read

System DesignDatabases

System Design Simulator: Build, Break, and Fix Databases

Interactive SimCity-style simulator where you build and break infrastructure. Add shards, replicas, and watch cascade failures teach you system design.

10 min read

AIMath

Tensors Explained: From Scalars to High-Dimensional Data

Understand tensors visually: scalar vs vector vs matrix vs tensor. Learn NumPy shape intuition with interactive examples and visualizations.

7 min read

LeetcodeRecursion

Why Recursion Burns Your CPU (And How Memoization Fixes It)

Visualize why naive recursion explodes exponentially. Watch memoization turn chaos into order with an interactive Fibonacci simulator.

9 min read

LeetcodeArrays

Sliding Window Algorithm: Why O(n²) is Just Bad Memory

Visualize why O(n²) is inefficient through a heat map simulator. Watch brute force burn CPU cycles while sliding window glides smoothly.

15 min read

Interactive Tools

Calculators and playgrounds for Python developers and ML engineers

Unix Timestamp Converter

Convert timestamps to dates

Current Unix TimeLive

—

Try it

Tokenizer Playground

See how LLMs read text

“Hello, GPT!”6 tokens

Hello,▁GPT!

BPE tokenization splits text into subwords

Try it

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Latest Posts

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LeetcodeGraphs

Graph Traversal: BFS vs DFS Step by Step

Step through BFS and DFS on graphs visually. Compare queue vs stack, see the visited set in action, with interactive simulator and Python code.

12 min read

LeetcodeGraphs

Topo Sort: How npm Decides What Runs First

Master topological sort with Kahn's algorithm and DFS. Interactive simulator lets you build DAGs and watch in-degrees drop to zero step by step.

14 min read

LeetcodeGraphs

Dijkstra's Algorithm: Shortest Paths Step by Step

Step through Dijkstra's algorithm visually. See how a min-heap and edge relaxation find shortest paths, with interactive simulator and Python code.

12 min read

LeetcodeDynamic Programming

Interval DP: Solve Ranges Inside Out

Master Interval Dynamic Programming. Build dp[i][j] intuition, see why greedy fails, and derive Burst Balloons and Palindrome Subseq like a candidate.

13 min read

LeetcodeDynamic Programming

Master String DP: LCS, Edit Distance & Beyond

Master the String DP pattern by deriving Longest Common Subsequence and Edit Distance from first principles. Two LeetCode classics, one template.

14 min read

LeetcodeDynamic Programming

Master Unbounded Knapsack DP: Coin Change & Beyond

Master Unbounded Knapsack DP by deriving Coin Change and Coin Change II from first principles. Two LeetCode classics, one forward-loop template.

14 min read