py3.py 文件源码

def __init__(self, name, mode='r', closefd=True, opener=None):
        if isinstance(name, int):
            fileno = name
            self._name = "<fd:%d>" % fileno
        else:
            assert isinstance(name, six.string_types)
            with open(name, mode) as fd:
                self._name = fd.name
                fileno = _original_os.dup(fd.fileno())

        notify_opened(fileno)
        self._fileno = fileno
        self._mode = mode
        self._closed = False
        set_nonblocking(self)
        self._seekable = None