def _get_dev_from_reader(self):
readers = list(open_ccid(self._reader_filter))
if len(readers) == 1:
drv = readers[0]
return YubiKey(Descriptor.from_driver(drv), drv)
return None
def _readers_changed(self, filter):
old_readers = self._readers
self._readers = list(open_ccid(filter))
readers_changed = len(self._readers) != len(old_readers)
return readers_changed