need more example how to use stitch #6

i try to follow example code and get this error

`KeyError Traceback (most recent call last)
in ()
3 from stitchclient.client import BufferEntry, Client
4
----> 5 with Client(int(os.environ['STITCH_CLIENT_ID']), os.environ['STITCH_TOKEN'], callback_function=print) as c:
6 for i in range(1,10):
7 c.push({'action': 'upsert',

/usr/lib/python3.6/os.py in getitem(self, key)
667 except KeyError:
668 # raise KeyError with the original key value
--> 669 raise KeyError(key) from None
670 return self.decodevalue(value)
671

KeyError: 'STITCH_CLIENT_ID'`