Python parser Module tutorial

I am writing an application which reads an input file that currently has its own grammar, which is processed by lex/yac开发者_StackOverflowc.

I'm looking to modify this so as to make this input file a Python script instead, and was wondering if someone can point me to a beginner's guide to using the parser module in Python. I'm fairly new to Python itself, but have worked through a fair chunk of the online tutorial.

From what I have researched, I know there are options (such as pyparsing) which can allow me to keep the existing grammar and use Pyparsing as a replacement for lex/yacc. However, I am curious to learn the Python parser module in more detail and explore its feasibility.

Thanks.

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You mean the parser module? It's a parser for Python source code only, not a general purpose parser. You can't use it to parse anything else.

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As Jochen said, the parser module is for parsing Python code. I think you're best off checking out Ned Batchelder's list of parsers. PyParsing does things pretty differently from Lex and Yacc, so I'm not sure why you think you could keep your existing grammar and lexer. A better bet might be David Beazley's PLY toolkit. It's solid and has excellent documentation.

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I recommend that you check out https://github.com/erezsh/lark

It's great for newcomers to parsing: It can parse ALL context-free grammars, it automatically builds an AST (with line & column numbers), and it accepts the grammar in EBNF format, which is considered the standard and is very easy to write.