ptyprocess.py 文件源码

def isatty(self):
        '''This returns True if the file descriptor is open and connected to a
        tty(-like) device, else False.

        On SVR4-style platforms implementing streams, such as SunOS and HP-UX,
        the child pty may not appear as a terminal device.  This means
        methods such as setecho(), setwinsize(), getwinsize() may raise an
        IOError. '''

        return os.isatty(self.fd)