how to equate key.chars with its name

Question

I created a Text widget from Tkinter and when a user types something I want to collect it is as a word for example if the user press backspace the last letter should be removed or if it other letters, it should be printed. However, when I try to equalize keys. chars with its own name I return nothing

self.text.bind('<Key>', self.callback)


def callback(self, event):
    key = '{k!r}'.format(k=event.char)
    if key == '\x08' : # backspace
        self.keys = self.keys[:-1]