Huge gains from using lists instead of generators in string prettifier
Diminishing gains from a few closures in code_gen
One code-gen fix (and a test case) for None leaking into code-gen result list.
Even larger gains to be had in node_util for tree scrubbing, etc., but not now
Overall, when running rtrip on the 3.6 stdlib, this reduces the time spent in code generation by 40%, for an overall gain of 23%. There is lots of room for improvement in node_util (for the scrubbing, comparison, and dumping, not for the code generation), but I'm not willing to do that at the moment.
edited: Found even more gains in the strings, and created a fast comparison in node_util for rtrip. rtrip is much faster now.
Overall, when running rtrip on the 3.6 stdlib, this reduces the time spent in code generation by 40%, for an overall gain of 23%. There is lots of room for improvement in node_util (for the scrubbing, comparison, and dumping, not for the code generation), but I'm not willing to do that at the moment.
edited: Found even more gains in the strings, and created a fast comparison in node_util for rtrip. rtrip is much faster now.