(assertion)
return return_true if bool(assertion) else return_false
https://en.wikipedia.org/wiki/Predicate_(mathematical_logic)
https://en.wikipedia.org/wiki/Predicate_(mathematical_logic)
https : // en . wikipedia . org / wiki / Predicate_ ( mathematical_logic )
def predicate(assertion):
    """
    https://en.wikipedia.org/wiki/Predicate_(mathematical_logic)
    """
    return return_true if bool(assertion) else return_false
def predicate ( assertion ) : return return_true if bool ( assertion ) else return_false