Left recursion is not a problem for LR parsing
See discussion here: Left recursion in LR(1) parsers. Note that templatetypedef wrote:
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Python: Function Signatures in Decorator Design
其实在 Fluent Python: Chapter 7 - Function Decorators and Closures 有讲，但没有专注在 signature 上。
What Can a Parser Return? Six Output Forms, LL vs LR
Output Type 1: Boolean (i.e. acceptance only)
Python Language Services: ast module (vs deprecated parser module for parse trees)
Parse Trees vs ASTs
Python Language Services: tokenize module
tokenize module
Python Language Services: keyword Module
Docs: keyword — Testing for Python keywords Source Code: cpython/Lib/keyword.py
Python Language Services: token module (with intro to globals())
1. Python token module
Input Ambiguity vs Grammar Ambiguity / Theory vs Practice
本文是对 Josh Haberman 的 LL and LR in Context: Why Parsing Tools Are Hard 的总结。