date.py 文件源码

def sql_format(value):
        if isinstance(value, (Query, Expression)):
            return value
        if value is None:
            return None
        if isinstance(value, basestring):
            year, month, day = map(int, value.split("-", 2))
            return datetime.date(year, month, day)

        assert(isinstance(value, datetime.date))
        # Allow datetime with min time for XML-RPC
        # datetime must be tested separately because datetime is a
        # subclass of date
        assert(not isinstance(value, datetime.datetime)
            or value.time() == datetime.time())
        return value