environment/lib/python2.7/site-packages/IPython/external/pexpect/_pexpect.py
def setwinsize(self, r, c):

        """This sets the terminal window size of the child tty. This will cause
        a SIGWINCH signal to be sent to the child. This does not change the
        physical window size. It changes the size reported to TTY-aware
        applications like vi or curses -- applications that respond to the
        SIGWINCH signal. """

        # Check for buggy platforms. Some Python versions on some platforms
        # (notably OSF1 Alpha and RedHat 7.1) truncate the value for
        # termios.TIOCSWINSZ. It is not clear why this happens.
        # These platforms don't seem to handle the signed int very well;
        # yet other platforms like OpenBSD have a large negative value for
        # TIOCSWINSZ and they don't have a truncate problem.
        # Newer versions of Linux have totally different values for TIOCSWINSZ.
        # Note that this fix is a hack.
        TIOCSWINSZ = getattr(termios, 'TIOCSWINSZ', -2146929561)
        if TIOCSWINSZ == 2148037735L: # L is not required in Python >= 2.2.
            TIOCSWINSZ = -2146929561 # Same bits, but with sign.
        # Note, assume ws_xpixel and ws_ypixel are zero.
        s = struct.pack('HHHH', r, c, 0, 0)
        fcntl.ioctl(self.fileno(), TIOCSWINSZ, s)
def setwinsize(self, r, c):

        """This sets the terminal window size of the child tty. This will cause
        a SIGWINCH signal to be sent to the child. This does not change the
        physical window size. It changes the size reported to TTY-aware
        applications like vi or curses -- applications that respond to the
        SIGWINCH signal. """

        # Check for buggy platforms. Some Python versions on some platforms
        # (notably OSF1 Alpha and RedHat 7.1) truncate the value for
        # termios.TIOCSWINSZ. It is not clear why this happens.
        # These platforms don't seem to handle the signed int very well;
        # yet other platforms like OpenBSD have a large negative value for
        # TIOCSWINSZ and they don't have a truncate problem.
        # Newer versions of Linux have totally different values for TIOCSWINSZ.
        # Note that this fix is a hack.
        TIOCSWINSZ = getattr(termios, 'TIOCSWINSZ', -2146929561)
        if TIOCSWINSZ == 2148037735L: # L is not required in Python >= 2.2.
            TIOCSWINSZ = -2146929561 # Same bits, but with sign.
        # Note, assume ws_xpixel and ws_ypixel are zero.
        s = struct.pack('HHHH', r, c, 0, 0)
        fcntl.ioctl(self.fileno(), TIOCSWINSZ, s)
This sets the terminal window size of the child tty. This will cause
        a SIGWINCH signal to be sent to the child. This does not change the
        physical window size. It changes the size reported to TTY-aware
        applications like vi or curses -- applications that respond to the
        SIGWINCH signal.