file.py 文件源码

def open(self, flags):
        os_flags = {
            'r': os.O_RDONLY,
            'w': os.O_WRONLY,
            'w+': os.O_WRONLY | os.O_CREAT,
        }
        try:
            self._fd = os.open(self.url.path, os_flags[flags])
        except KeyError:
            raise ValueError('Unknow flags: \'%s\'' % flags)