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Alexander, I don't see a need to make everything a one-liner. Dealing with a mix of dates and datetimes is easily sorted out with an `if` statement, like
def func(thedate):
 if isinstance(thedate, datetime.datetime):
 thedate = thedate.date()
 # and now `thedate` is a bona fide datetime.date
Or stick the two lines in a utility function.
If you're determined to do it one line, because datetime is a subclass of date you could also use .combine() to force everything to class datetime.datetime in one line:
_ZEROT = datetime.time()
def func(thedatetime):
 thedatetime = datetime.combine(thedatetime, _ZEROT)
 # and now `thedatetime` is a bona fide datetime.datetime