<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def has_saved(self, addr):
 """Test if device has data from the saved data file."""

        saved = False
        if self._saved_devices.get(addr, None) is not None:
            saved = True
        return saved