问题
I saw http://matt.might.net/teaching/compilers/spring-2015/ saying Python 3.4 is LL(1)
Is Python 3.5's grammar still LL(1) so one can write a recursive descent parser?
回答1:
Yes. This is a deliberate language feature, and not just something that happened to be the case. PEP 3099 explicitly rejected any changes to this for the Python 2 -> 3 transition (a notably bigger transition than any 3.x -> 3.y will be):
The parser won't be more complex than LL(1).
Simple is better than complex. This idea extends to the parser. Restricting Python's grammar to an LL(1) parser is a blessing, not a curse. It puts us in handcuffs that prevent us from going overboard and ending up with funky grammar rules like some other dynamic languages that will go unnamed, such as Perl.
来源：https://stackoverflow.com/questions/31637435/is-python-3-5s-grammar-ll1