How to Shrink Small JSON Records in Python With Zstandard Dictionaries
A hands-on tutorial that trains a Zstandard dictionary for small...
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How to Use the New sentinel() Builtin in Python 3.15 to Tell a Missing Argument From None
Python 3.15 adds a sentinel() builtin for unique placeholder...
How to Stop Pickle Deserialization Attacks in Python and Load Model Files Safely
Learn why unpickling runs code, then build an allowlist...
How to Stop Mass Assignment and Excessive Data Exposure in a FastAPI App
Build a small FastAPI profile API, attack it with eight...
How to Handle Daylight Saving Time in Python With zoneinfo and Stop Scheduling, Billing, and Logging Bugs
Reproduce the daylight saving bugs that skip or double scheduled...
How to Fix SQLite “database is locked” Errors in Python With WAL Mode, BEGIN IMMEDIATE, and Checkpoints
Reproduce SQLite’s “database is locked” error in Python, then...
How to Find Bugs Your Tests Miss in Python With Property-Based Testing and Hypothesis
A step-by-step Hypothesis tutorial that finds five real bugs in...
How to Replace asyncio.gather With TaskGroup in Python and Handle Failures With except*
Run three service calls at once in Python, watch asyncio.gather...
How to Find and Fix a Memory Leak in a Python Service With tracemalloc
Reproduce a leaking Python service, find the guilty lines with...
How to Evolve a Protobuf Schema Without Breaking Old Clients and Block Unsafe Edits in CI With Python
Learn which Protocol Buffers schema changes are safe, measure...