SyntaxError in mode.py line 230

hello digi
when running in python3:
```
from digi.xbee.devices import XBeeDevice
```
I get the following error:
```
  File "...\Python\Python39\lib\site-packages\digi\xbee\models\mode.py", line 230
    return sum(op.code for op in options if lambda option: option != cls.EXPLICIT)
                                            ^
SyntaxError: invalid syntax
```