AdvancedML model evaluation mistakes that make good numbers meaningless
Nine errors behind great offline metrics and bad production models: random splits on time series, threshold-free metrics, tuning on the test set.
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AdvancedProduction ML architecture: training-serving skew
The model is the small part. Training-serving skew, feature freshness, shadow deploys, drift detection, and monitoring that catches decay.
IntermediateBuild a chatbot that answers from your own PDFs in Python
Retrieval-augmented generation in plain Python: split a PDF into chunks, find the relevant ones, and let Claude answer using only those. No vector database required.
IntermediateGet structured JSON out of an LLM — reliably
Asking a model to reply in JSON works until it does not. Learn why tool schemas beat prompt begging, and how to validate every response before it reaches your code.
Beginnervenv vs conda vs uv — which Python environment tool should you use?
Three ways to keep project dependencies apart. A straight comparison of speed, package coverage and complexity, plus a clear recommendation for each situation.
BeginnerAuto-organize your downloads folder with Python
A script that sorts files into folders by type, handles name clashes safely, and can keep watching for new arrivals. Dry-run first, so nothing is ever lost.
IntermediateClean a messy CSV with pandas before you train anything
Ten pandas fixes for the problems every real dataset has: broken headers, duplicate rows, mixed types, silly outliers and inconsistent categories.
IntermediateBuild an AI push-up counter with pose estimation in Python
Use MediaPipe Pose to measure your elbow angle and count push-up reps automatically. The same state machine works for squats, curls and any repeated movement.
BeginnerExtract text from an image with Python (OCR that actually works)
Tesseract plus a few lines of OpenCV preprocessing turns blurry photos into clean text. Learn the cleanup steps that take accuracy from unusable to reliable.
Beginner'pip' is not recognized — fix it on Windows in 5 minutes
Windows says pip is not recognized as an internal or external command because pip is not on your PATH. Use python -m pip for an instant fix, then repair PATH properly.
BeginnerStop renaming files by hand
A beginner-friendly Python script that renames messy files in a folder — with a safe dry-run mode so nothing breaks.