lib2to3 helpfully provides pygram.python_grammar_no_print_statement for parsing Python 3 ('print' has the semantics of an identifier, not a keyword)

However, the same courtesy is not extended to 'exec', which also turns from a statement to an identifier in Python 3.

I'd propose adding something like python_grammar_no_print_and_exec_statement 

The name's a handful, but it's explicit and I can't think of anything else, given that we don't want to change the lib2to3 API at this time to rename these grammars using some other convention.