Now that we have started to see conditional expressions ... I would like to see them parenthesized.  The parens aren't as important as they are with generator expressions, but ... they matter.

From a recent checkin --

    level = 0 if "absolute_import" in self.futures else -1

Mentally, I can't help parsing that as "level = 0" plus comments that turn out to be code that triggers backracking.

When the expressions (particularly the true case) are longer, it gets even worse.

I think that adding parentheses would help, by at least signalling that the logic is longer than just the next (single) expression.

    level = (0 if "absolute_import" in self.futures else -1)