How to use the devlib.utils.types.boolean function in devlib

def directory_exists(self, filepath):
        output = self.execute('if [ -d {} ]; then echo 1; else echo 0; fi'.format(quote(filepath)))
        # output from ssh my contain part of the expression in the buffer,
        # split out everything except the last word.
        return boolean(output.split()[-1])  # pylint: disable=maybe-no-member

def _decode(string):
        value_type = string[:1]
        value_dimension = string[1:2]
        value = unquote(string[2:])
        if value_dimension == 's':
            if value_type == 's':
                return str(value)
            elif value_type == 'b':
                return boolean(value)
            elif value_type == 'd':
                return int(value)
            elif value_type == 'f':
                return float(value)
            elif value_type == 'i':
                return int(value)
            elif value_type == 'n':
                return None
        elif value_dimension == 'l':
            return [ParameterDict._decode(value_type + 's' + x)
                    for x in value.split('0newelement0')]
        else:
            raise ValueError('Unknown {} {}'.format(type(string), string))

def set_auto_rotation(self, autorotate):
        cmd = 'settings put system accelerometer_rotation {}'
        self.execute(cmd.format(int(boolean(autorotate))))

def is_screen_on(self):
        output = self.execute('dumpsys power')
        match = ANDROID_SCREEN_STATE_REGEX.search(output)
        if match:
            if 'DOZE' in match.group(1).upper():
                return True
            return boolean(match.group(1))
        else:
            raise TargetStableError('Could not establish screen state.')

def set_airplane_mode(self, mode):
        root_required = self.get_sdk_version() > 23
        if root_required and not self.is_rooted:
            raise TargetStableError('Root is required to toggle airplane mode on Android 7+')
        mode = int(boolean(mode))
        cmd = 'settings put global airplane_mode_on {}'
        self.execute(cmd.format(mode))
        self.execute('am broadcast -a android.intent.action.AIRPLANE_MODE '
                     '--ez state {}'.format(mode), as_root=root_required)

def file_exists(self, filepath):
        command = 'if [ -e {} ]; then echo 1; else echo 0; fi'
        output = self.execute(command.format(quote(filepath)), as_root=self.is_rooted)
        return boolean(output.strip())

def set_auto_brightness(self, auto_brightness):
        cmd = 'settings put system screen_brightness_mode {}'
        self.execute(cmd.format(int(boolean(auto_brightness))))

def get_airplane_mode(self):
        cmd = 'settings get global airplane_mode_on'
        return boolean(self.execute(cmd).strip())