pyparsing/pyparsing

Health v2 · maintenance only

Adoption not part of the score

2492 stars · 342 forks observed · 2026-09-26

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded

pyparsing is a Python library for building Parsing Expression Grammar (PEG) parsers directly in Python code using composable classes and operators. It offers a readable alternative to lex/yacc or regex-based parsing, handling whitespace, quoted strings, and embedded comments automatically.

Use cases

• parse structured text like config files or log formats in Python
• build a DSL or small language parser without lex/yacc
• parse SQL or algebraic expressions
• replace fragile regex parsing with a real grammar
• extract fields from text with readable grammar definitions

When to choose

• you want to define grammars directly in readable Python code
• you need a lightweight pure-Python parser with no build step
• your grammar is small to medium complexity
• you want quick parsing of text formats like config files or formulas

When to avoid

• you need maximum parsing performance for large inputs
• you require full lexer/parser tooling like error recovery of yacc-grade tools
• you are parsing very large or complex grammars where a generator like ANTLR fits better

Facets

library · maturity stable

parser parsers programming-languages developer-tools python cross-platform peg parser-combinators text-processing grammar

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