Items tagged parsing, python
Filters: parsing × python × Sorted by date
Lark parsing library JSON tutorial (via) A very convincing tutorial for a new-to-me parsing library for Python called Lark.
The tutorial covers building a full JSON parser from scratch, which ends up being just 19 lines of grammar definition code and 15 lines for the transformer to turn that tree into the final JSON.
It then gets into the details of optimization—the default Earley algorithm is quite slow, but swapping that out for a LALR parser (a one-line change) provides a 5x speedup for this particular example. # 13th August 2023, 9:50 pm
Building Search DSLs with Django (via) Neat tutorial by Dan Lamanna: how to build a GitHub-style search feature—supporting modifiers like “is:open author:danlamanna”—using PyParsing and the Django ORM. # 19th June 2023, 8:30 am
Parsing CSV using ANTLR and Python 3. I’ve been trying to figure out how to use ANTLR grammars from Python—this is the first example I’ve found that really clicked for me. # 6th April 2018, 2:33 pm
Parse shell one-liners with pyparsing. Neat introduction to the pyparsing library, both for parsing tokens into labeled sections and constructing an AST from them. # 22nd October 2017, 1:35 pm
South’s Design. Andrew Godwin explains why South resorts to parsing your models.py file in order to construct information about for creating automatic migrations. # 13th May 2009, 12:30 pm
Simple Top-Down Parsing in Python. Eye-opening tutorial on building a recursive descent parser for Python, in Python that uses top-down operator precedence. # 19th July 2008, 11:37 pm
python4ply tutorial. python4ply is a parser for Python written in Python using the PLY toolkit, which compiles to Python bytecode using the built-in compiler module. The tutorial shows how to use it to add support for Perl-style 1_000_000 readable numbers. # 11th March 2008, 5:49 am