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)
-jJ
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