check-code: reintroduce str.format() ban for 3.x porting...
check-code: reintroduce str.format() ban for 3.x porting
In their infinite wisdom, the Python maintainers stripped bytes of its
% and format() methods for 3.x. They've now added % back to 3.5, but
format() is still missing. Since we don't have any particular need for
it, we should keep avoiding it.