docs: def page(self, attr=None, fill=u' '):
          u'''Fill the entire screen.'''
          if attr is None:
              attr = self.attr
          if len(fill) != 1:
              raise ValueError
          info = CONSOLE_SCREEN_BUFFER_INFO()
          self.GetConsoleScreenBufferInfo(self.hout, byref(info))
          if info.dwCursorPosition.X != 0 or info.dwCursorPosition.Y != 0:
              self.SetConsoleCursorPosition(self.hout, self.fixcoord(0, 0))
  
          w = info.dwSize.X
          n = DWORD(0)
          for y in range(info.dwSize.Y):
              self.FillConsoleOutputAttribute(self.hout, attr, 
                                              w, self.fixcoord(0, y), byref(n))
              self.FillConsoleOutputCharacterW(self.hout, ord(fill[0]), 
                                               w, self.fixcoord(0, y), byref(n))
  
          self.attr = attr