http://jbylund.github.io/tags/python/Recent content in Python on Joe BylundHugo -- gohugo.ioen© 2026 Joe BylundTue, 28 Jul 2026 00:00:00 +0000http://jbylund.github.io/posts/00160_postgres-copy-loading/Tue, 28 Jul 2026 00:00:00 +0000http://jbylund.github.io/posts/00160_postgres-copy-loading/Switching from row-by-row inserts to PostgreSQL’s COPY protocol meaningfully cut import time. Why COPY is fast, how to stream data into it from Python, and two approaches to expanding a JSON blob into a typed row.http://jbylund.github.io/posts/00128_compiling-ast-to-sql/Tue, 14 Jul 2026 00:00:00 +0000http://jbylund.github.io/posts/00128_compiling-ast-to-sql/Each AST node emits a SQL fragment and bound parameters. How the node hierarchy works, how different field types generate different SQL, and why user input never touches the query string. Covers text/regex/arithmetic; JSONB operators and the count+results CTE are in separate posts.http://jbylund.github.io/posts/00112_implicit-and-query-balancing/Tue, 07 Jul 2026 00:00:00 +0000http://jbylund.github.io/posts/00112_implicit-and-query-balancing/The Scryfall query language implicitly ANDs adjacent terms — pyparsing does not. This post covers the preprocessing layer built on top: implicit AND injection, query balancing in two languages, and the edge cases that required fixes.http://jbylund.github.io/posts/00096_query-dsl-with-pyparsing/Fri, 03 Jul 2026 00:00:00 +0000http://jbylund.github.io/posts/00096_query-dsl-with-pyparsing/How I evaluated parsing approaches for Scryfall’s query language: why regex and ANTLR were ruled out, how Lark compares to pyparsing, and why pyparsing won.http://jbylund.github.io/posts/00064_falcon-bjoern-web-framework/Sat, 27 Jun 2026 00:00:00 +0000http://jbylund.github.io/posts/00064_falcon-bjoern-web-framework/Why Sylvan Librarian uses Falcon and Bjoern instead of the FastAPI + uvicorn default: a preference for explicit, close-to-vanilla Python over framework magic.http://jbylund.github.io/posts/00032_why-build-a-self-hosted-scryfall/Sat, 20 Jun 2026 00:00:00 +0000http://jbylund.github.io/posts/00032_why-build-a-self-hosted-scryfall/Motivation for building Sylvan Librarian: owning the query language, and the killer feature Scryfall can’t do — arithmetic comparisons across card attributes.