import os

class Display:

  def __init__(self, cols = os.environ.get('COLUMNS', 80), lines = os.environ.get('LINES', 50):

    self.backbuffer = np.full((cols, lines), ' ')

  def clear(self):

    self.backbuffer = ' '

  def plot(self, x, y, char='X'):

    self.backbuffer[x,y]=char

  def blit(self):

    for line in self.backbuffer:

      print(''.join(line))

It could be greatly improved.