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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def getch(self):
 """ Read one character from stdin. If stdin is not a tty or set `getch_enabled`=False, read input as one line. :return: unicode: """

        ch = self._get_one_char()
        if self.keep_input_clean:
            self.clear_input_buffer()

        try:
            # accept only unicode characters (for Python 2)
            uch = to_unicode(ch, 'ascii')
        except UnicodeError:
            return ''

        return uch if self._check_key_repeat(uch) else ''