Class Combinative

recipes/Python/415345_write_sql_via_python/recipe-415345.py:273–283

        return Not(boolexpr)

class Combinative(object):
    
    def combine(cls, *combinatives):
        args = []
        for c in combinatives:
            if type(c) is cls:
                args.extend([e for e in c.elements if e])
            else:
                args.append(c)
        return cls(*args)
    combine = classmethod(combine)

class InfixedExpression(Infixed, Expression):
    def __init__(self, infix, *expressions):