Fix #1297 (#1342)

* Fix #1297

This makes a deepcopy of the user_data and chat_data dict as suggested by @Bibo-Joshi

* Fix dictpersistence aswel.

telegram/ext/dictpersistence.py

@@ -17,6 +17,8 @@
 # You should have received a copy of the GNU Lesser Public License
 # along with this program.  If not, see [http://www.gnu.org/licenses/].
 """This module contains the DictPersistence class."""
+from copy import deepcopy
+
 from telegram.utils.helpers import decode_user_chat_data_from_json,\
     decode_conversations_from_json, enocde_conversations_to_json
 
@@ -129,7 +131,7 @@ class DictPersistence(BasePersistence):
             pass
         else:
             self._user_data = defaultdict(dict)
-        return self.user_data.copy()
+        return deepcopy(self.user_data)
 
     def get_chat_data(self):
         """Returns the chat_data created from the ``chat_data_json`` or an empty defaultdict.
@@ -141,7 +143,7 @@ class DictPersistence(BasePersistence):
             pass
         else:
             self._chat_data = defaultdict(dict)
-        return self.chat_data.copy()
+        return deepcopy(self.chat_data)
 
     def get_conversations(self, name):
         """Returns the conversations created from the ``conversations_json`` or an empty

telegram/ext/picklepersistence.py

@@ -19,6 +19,7 @@
 """This module contains the PicklePersistence class."""
 import pickle
 from collections import defaultdict
+from copy import deepcopy
 
 from telegram.ext import BasePersistence
 
@@ -122,7 +123,7 @@ class PicklePersistence(BasePersistence):
             self.user_data = data
         else:
             self.load_singlefile()
-        return self.user_data.copy()
+        return deepcopy(self.user_data)
 
     def get_chat_data(self):
         """Returns the chat_data from the pickle file if it exsists or an empty defaultdict.
@@ -142,7 +143,7 @@ class PicklePersistence(BasePersistence):
             self.chat_data = data
         else:
             self.load_singlefile()
-        return self.chat_data.copy()
+        return deepcopy(self.chat_data)
 
     def get_conversations(self, name):
         """Returns the conversations from the pickle file if it exsists or an empty defaultdict.