The go-to resource for upgrading Python, Django, Flask, and your dependencies.
70 articles on upgrading Python, Django, Flask, and managing dependencies
Learn how to detect and fix memory leaks in Celery workers using Python's built-in tracemalloc module. Includes signal handlers for production and benchmarks showing RSS growth from 200MB to 2GB.
Implement CSP headers in Flask using @after_request, nonces, and report-only mode to mitigate XSS risks. Covers directives, common violations, and verification.
Implement OAuth2 password flow in FastAPI with JWT tokens: secure authentication using PyJWT and passlib, including login endpoint, protected routes, and curl tests with a fake user database.
Step-by-step guide to migrate from pyenv to mise for Python version management and upgrades from Python 3.12 to 3.13. Mise offers multi-language support, tasks, and project-specific environments.
Step-by-step guide to migrate Flask apps from requirements.txt to pyproject.toml using Poetry for reproducible builds, efficient installs, and modern packaging standards.
Migrate Django tests from unittest to pytest: Replace setUp with 7 fixture patterns for faster, parallel tests. Django 5.1 + pytest-django 5.0 examples.
Mise prebuilt binaries vs source compilation: up to 8x faster Python installs in benchmarks on Ubuntu/macOS. Includes setup, workflow, and when to use each.
Install and manage Python 3.11, 3.12, and 3.13 simultaneously using mise on Windows WSL2. Covers installation, per-project configuration with .tool-versions, and virtual environment integration.
Compare mise and asdf Python version managers on M1/M2 Macs with real benchmarks. Discover which is faster for Python development on Apple Silicon.
pip-tools vs Poetry vs uv comparison for conflicting setuptools versions: Benchmarks, resolution strategies, and which Python dependency manager prevents build failures in complex environments.
poetry add vs pip install comparison: Learn how Poetry lock files prevent production dependency conflicts, ensure reproducible builds, and solve Python dependency hell for reliable deployments.
Pydantic v2 @model_validator(mode='before') receives model instances in some cases like field assignment. Fixes for FastAPI migration, including code examples and tests.
Configure .coveragerc to omit virtual environments (venv, .tox), migrations, and other non-source files from pytest-cov reports, focusing on application code. Includes configuration example and Django demo.
pytest-mock vs unittest.mock: MagicMock false positives hide KeyError/AttributeError bugs. pytest mocker.patch with autospec=True catches issues early. Python mocking pitfalls, migration guide, strict mocking best practices. Keywords: pytest-mock vs unittest.mock, MagicMock false positive, pytest mocker fixture, mock spec=Dict, python mocking best practices.
Python 3.12 EOL: Active support ended April 2025, security fixes until Oct 2028. Upgrade to 3.13 guide using mise/asdf/uv: timelines, steps, compatibility, new features.
We benchmark a minimal FastAPI application on Python 3.12 and 3.13 to measure real-world performance differences in RPS and latency for JSON GET and POST endpoints using Locust and uvicorn workers.
Python performance optimization guide: Profile with cProfile/py-spy, fix memory leaks with memory_profiler, speed up with Numba JIT and multiprocessing. Examples demonstrate up to 5-10x speedups and memory savings in loops, pandas, and APIs. Tested with Python 3.13 tools. Keywords: python performance optimization, optimize python code, python profiling cProfile py-spy, reduce python memory usage, python numba speedup, python multiprocessing performance.
Compare the best Python version managers: pyenv for Python-specific control, asdf for multi-language support, and mise for speed and versatility. Learn installation, usage, and which to choose in 2026.
Django ORM N+1 query optimization: select_related for ForeignKey (joins), prefetch_related for ManyToMany/reverse FK (separate queries+caches). Blog example: 501→151 queries, 500ms→150ms (70% faster). django-debug-toolbar verify. Keywords: 'django select_related prefetch_related', 'django n+1 fix', 'django orm performance', 'reduce django queries', 'select_related vs prefetch_related django'.
Reduce FastAPI Docker images from 1.2 GB to 145 MB using Alpine multistage builds and uv. Includes benchmarks, production Dockerfile, .dockerignore, and pitfalls.
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