def backward_delete_word ( self , e ) : # (Control-Rubout)
 self . l_buffer . backward_delete_word ( self . argument_reset ) self . finalize ( )
python delete character on screen
u Delete the character behind the cursor . A numeric argument means to kill the characters instead of deleting them .
def backward_delete_word(self, e): # (Control-Rubout)
        u"""Delete the character behind the cursor. A numeric argument means
        to kill the characters instead of deleting them."""
        self.l_buffer.backward_delete_word(self.argument_reset)
        self.finalize()