Python Context Managers: Resource Management with with
A practical guide to Python context managers: __enter__ and __exit__, contextlib.contextmanager, ExitStack, async with, FastAPI lifespan, locks and common bugs.
Category: Python
Posts
Python Email Automation: smtplib, aiosmtplib and SPF
Python email automation done right: EmailMessage, smtplib with app passwords, aiosmtplib for batches, Jinja2 templates, and SPF, DKIM and DMARC for delivery.
Advanced pytest: Fixtures, Mocking and Hypothesis
Advanced testing with pytest 8: fixture scopes, parametrize, mocking with mocker and respx, async tests, Hypothesis property tests, snapshots and CI settings.
Python Image Processing: Pillow or OpenCV?
Image processing in Python with Pillow 11+ and OpenCV 4.x: safe uploads, EXIF rotation, WebP, headless OpenCV in Docker and a background processing pipeline.
Python PDF Processing: pypdf, pdfplumber and WeasyPrint
Read, split, merge, encrypt and generate PDFs in Python: pypdf, pdfplumber for tables, WeasyPrint for HTML to PDF, OCRmyPDF for scans and pyHanko for signing.
Python asyncio in Practice: TaskGroup, Timeouts, Semaphores
A practical Python asyncio guide: TaskGroup, asyncio.timeout, Semaphore, to_thread, except* and what Python 3.12 to 3.14 changed, with runnable examples.
Python Performance Profiling: cProfile, py-spy, Scalene
A practical guide to Python performance profiling: cProfile for functions, py-spy for live processes, Scalene for line-level CPU and memory, plus memray.
Python Logging Best Practices with structlog
Python logging best practices: stdlib logging rules, JSON logs with structlog, request IDs, redacting secrets, OpenTelemetry trace IDs, common mistakes.
Poetry vs uv: Comparing Python Project Management Tools
Poetry and uv for Python project management: lock files, dependency groups, Docker and CI setups, publishing. An honest comparison of when to use which.
Fast Crypto Analysis in pandas 3: Vectorize, Then Polars
Crypto OHLCV analysis in pandas 3 without loops: the real cost of iterrows and apply, rolling signals, sane dtypes, Parquet, and a measured Polars test.
