Implementing Content Security Policy (CSP) Headers in Flask to Prevent XSS
Implement CSP headers in Flask using @after_request, nonces, and report-only mode to mitigate XSS risks. Covers directives, common violations, and verification.
All Articles
69 articles on upgrading Python, Django, Flask, and managing dependencies
Implementing OAuth2 with Password Flow in FastAPI: Complete JWT Token Example
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.
Migrate from pyenv to mise: Complete Guide for Python 3.12 to 3.13 Upgrades
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.
Migrate from requirements.txt to pyproject.toml: 5-Step Process for Flask Applications
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.
Migrating Django Tests from unittest to pytest: 7 Patterns for Using Fixtures Instead of setUp
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 Python Installation Times: Comparing Prebuilt Binaries vs Source Compilation
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.
Managing Python 3.11, 3.12, and 3.13 Simultaneously with mise on Windows WSL2
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.
mise vs asdf for Python Development: Performance Benchmarks on M1/M2 Macs
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: Which Tool Handles Conflicting setuptools Versions Best?
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: When Lock Files Prevent Production Dependency Conflicts
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 Migration in FastAPI: Fixing model_validator Decorator Breaking Changes
Pydantic v2 @model_validator(mode='before') receives model instances in some cases like field assignment. Fixes for FastAPI migration, including code examples and tests.
pytest-cov: Excluding Virtual Environment and Migration Files from Coverage Reports
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: When MagicMock Causes False Positive Test Passes
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 Timeline: Planning Your Upgrade to Python 3.13 Before Support Ends
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.
Python 3.13 Performance Gains: Benchmarking FastAPI Endpoints Before and After Upgrade
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: Profile, Optimize, and Benchmark Code Speedups
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.
Python Version Management (asdf, mise, pyenv)
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.
Reducing Django ORM Query Time by 70% with select_related and prefetch_related
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'.
Reducing Docker Image Size from 1.2GB to 145MB for Python FastAPI Applications
Reduce FastAPI Docker images from 1.2 GB to 145 MB using Alpine multistage builds and uv. Includes benchmarks, production Dockerfile, .dockerignore, and pitfalls.
Reducing Flask Application Startup Time from 8 Seconds to 800ms
Flask startup optimization: Diagnose slow imports/extensions with py-spy/cProfile, implement lazy loading, disable debug mode, gunicorn preload/app factory. Benchmarks: 8.2s → 0.82s (90% faster). Fix dev restarts, serverless cold starts, k8s deployments.
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