code: def send_text(hwnd, txt):
      
      try:
          for c in txt:
              if c == '\n':
                  win32api.SendMessage(hwnd, win32con.WM_KEYDOWN, win32con.VK_RETURN, 0)
                  win32api.SendMessage(hwnd, win32con.WM_KEYUP, win32con.VK_RETURN, 0)
              else:
                  win32api.SendMessage(hwnd, win32con.WM_CHAR, ord(c), 0)            
      except Exception as ex:
          print('error calling SendMessage ' + str(ex))
docs: sends the text 'txt' to the window handle hwnd using SendMessage