What Can a Parser Return? Six Output Forms, LL vs LR
Output Type 1: Boolean (i.e. acceptance only)
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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。
General Parsing (GLL/GLR) at a Glance
参考：Practical GeneralTop-down Parsers, by Ali Afroozeh and Anastasia Izmaylova
LR Parsing #7: LR(0) vs SLR(1) vs LR(1)
Reference: SLR and LR(1) Parsing Online Tool: JSMachines LR(1) Parser Generator