from pathlib import Pathpath = Path('..')/'test.txt'  # Text file with contents "Goodbye, world"project_id = 'secret_ID'file_path = 'data/' + path.namef = gl.project_files.get(file_path=file_path, ref='master', project_id=project_id)   f.content = base64.b64encode(path.open('rb').read())f.save(branch_name='master', commit_message='Updated ' + file_path , encoding='base64')

TypeError                                 Traceback (most recent call last)<ipython-input-17-7015cf3aaaad> in <module>()     12      13 f.content = base64.b64encode(path.open('rb').read())---> 14 f.save(branch_name='master', commit_message='Updated ' + file_path , encoding='base64')/home/hidden_user/.virtualenvs/hidden_dir/lib/python3.5/site-packages/gitlab/objects.py in save(self, **kwargs)    318     def save(self, **kwargs):    319         if self._from_api:--> 320             self._update(**kwargs)    321         else:    322             self._create(**kwargs)/home/hidden_user/.virtualenvs/hidden_dir/lib/python3.5/site-packages/gitlab/objects.py in _update(self, **kwargs)    313             raise NotImplementedError    314 --> 315         json = self.gitlab.update(self, **kwargs)    316         self._set_from_dict(json)    317 /home/hidden_user/.virtualenvs/hidden_dir/lib/python3.5/site-packages/gitlab/__init__.py in update(self, obj, **kwargs)    621     622         # build data that can really be sent to server--> 623         data = obj._data_for_gitlab(extra_parameters=kwargs, update=True)    624     625         r = self._raw_put(url, data=data, content_type='application/json')/home/hidden_user/.virtualenvs/hidden_dir/lib/python3.5/site-packages/gitlab/objects.py in _data_for_gitlab(self, extra_parameters, update, as_json)    227         data.update(extra_parameters)    228 --> 229         return json.dumps(data) if as_json else data    230     231     @classmethod/usr/lib/python3.5/json/__init__.py in dumps(obj, skipkeys, ensure_ascii, check_circular, allow_nan, cls, indent, separators, default, sort_keys, **kw)    228         cls is None and indent is None and separators is None and    229         default is None and not sort_keys and not kw):--> 230         return _default_encoder.encode(obj)    231     if cls is None:    232         cls = JSONEncoder/usr/lib/python3.5/json/encoder.py in encode(self, o)    196         # exceptions aren't as detailed.  The list call should be roughly    197         # equivalent to the PySequence_Fast that ''.join() would do.--> 198         chunks = self.iterencode(o, _one_shot=True)    199         if not isinstance(chunks, (list, tuple)):    200             chunks = list(chunks)/usr/lib/python3.5/json/encoder.py in iterencode(self, o, _one_shot)    254                 self.key_separator, self.item_separator, self.sort_keys,    255                 self.skipkeys, _one_shot)--> 256         return _iterencode(o, 0)    257     258 def _make_iterencode(markers, _default, _encoder, _indent, _floatstr,/usr/lib/python3.5/json/encoder.py in default(self, o)    177     178         """--> 179         raise TypeError(repr(o) + " is not JSON serializable")    180     181     def encode(self, o):TypeError: b'R29vZGJ5ZSwgd29ybGQK' is not JSON serializable