db.py 文件源码

def get_marker(self, paramstyle='pyformat'):
        if paramstyle == 'qmark':
            return '?'
        elif paramstyle == 'numeric':
            return ':1'
        elif paramstyle is None or paramstyle in ['format', 'pyformat']:
            return '%s'
        raise UnknownParamstyle(paramstyle)