Welcome to Lark’s documentation!

Lark is a modern parsing library for Python. Lark can parse any context-free grammar.

Lark provides:

  • Advanced grammar language, based on EBNF

  • Three parsing algorithms to choose from: Earley, LALR(1) and CYK

  • Automatic tree construction, inferred from your grammar

  • Fast unicode lexer with regexp support, and automatic line-counting

Install Lark

$ pip install lark

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