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That particular use-case is easily handled by simply creating the correct function/method based on the criterion:
if py_ver < 3.6:
 def fribbletz():
 # do something in a 3.0-3.5 compatible way
else:
 def fribbletz():
 # otherwise use 3.6 methods
One possible up-side would by if macros were able to allow not erroring out when new syntax was used in the False branch; but really, we add new syntax so rarely even that is probably not worth it.