[Python] catch TextCtrl's key/char events and forward typed key to the stdin of a subprocess

I am trying to use wx.TextCtrl to catch the typed key events, and directly forward the typed key to the stdin of a subprocess. Please note, for my special purpose, I will completely disable the text editing feature of the TextCtrl. i.e., when I type a letter, the letter will not be appearing on the TextCtrl, it will be directly forwarded.
Here is some code to illustrate what I want.

# inside the main frame
self.text = wx.TextCtrl(self.panel, wx.ID_ANY, style=wx.TE_MULTILINE)
self.text.Bind(wx.EVT_KEY_DOWN, self.OnKey)
self.text.Bind(wx.EVT_CHAR, self.OnChar)
# ...

def OnKey(self, evt):
keycode = evt.GetKeyCode()
# ENTER

if keycode == 13:
self.subprocess.stdin.read("\n")
if keycode == 9:
self.subprocess.stdin.read("\t")
if keycode == 8:
self.subprocess.stdin.read("\b")
if keycode == 316:
pass # maybe some key will be ignored
else:
evt.skip()

def OnChar(self, evt):
key=chr(keycode)
self.subprocess.stdin.read(key)


I want to forward "ENTER", "TAB", "BACKSPACE", characters, numbers, etc., all the key input events to stdin, without letting TextCtrl to interfere. Is there a good way to do it? Or I have to explicitely match each key one by one?

Thanks for any suggestions!

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