In python3 a bytes object needs to be decoded after image upload

fbchat/client.py

@@ -323,6 +323,8 @@ class Client(object):
         :param image: a tuple of (file name, data, mime type) to upload to facebook
         """
         r = self._postFile(UploadURL, image)
+        if isinstance(r._content, str) is False:
+            r._content = r._content.decode("utf-8")
         # Strip the start and parse out the returned image_id
         return json.loads(r._content[9:])['payload']['metadata'][0]['image_id']