_fileobjectposix.py 文件源码

def __read(self, n):
        if not self._readable:
            raise UnsupportedOperation('read')
        while True:
            try:
                return _read(self._fileno, n)
            except (IOError, OSError) as ex:
                if ex.args[0] not in ignored_errors:
                    raise
            self.hub.wait(self._read_event)