diff --git a/telebot/__init__.py b/telebot/__init__.py
index ac54d20..ca6de4c 100644
--- a/telebot/__init__.py
+++ b/telebot/__init__.py
@@ -54,7 +54,7 @@ class TeleBot:
 
     def __notify_update(self, new_messages):
         for listener in self.update_listener:
-            t = threading.Thread(target=listener, args=(new_messages))
+            t = threading.Thread(target=listener, args=new_messages)
             t.start()
 
     def polling(self, interval=3):
diff --git a/telebot/apihelper.py b/telebot/apihelper.py
index 0444c4c..c381e8b 100644
--- a/telebot/apihelper.py
+++ b/telebot/apihelper.py
@@ -86,7 +86,8 @@ def send_location(token, chat_id, latitude, longitude, reply_to_message_id=None,
     req = requests.get(request_url, params=payload)
     return check_result(method_url, req)
 
-def send_chat_action(token,chat_id,action):
+
+def send_chat_action(token, chat_id, action):
     api_url = telebot.API_URL
     method_url = r'sendChatAction'
     request_url = api_url + 'bot' + token + '/' + method_url
@@ -94,6 +95,7 @@ def send_chat_action(token,chat_id,action):
     req = requests.get(request_url, params=payload)
     return check_result(method_url, req)
 
+
 def send_data(token, chat_id, data, data_type, reply_to_message_id=None, reply_markup=None):
     api_url = telebot.API_URL
     method_url = get_method_by_type(data_type)
diff --git a/telebot/types.py b/telebot/types.py
index 872732c..efba253 100644
--- a/telebot/types.py
+++ b/telebot/types.py
@@ -62,7 +62,7 @@ class Message:
     def de_json(cls, json_string):
         obj = json.loads(json_string)
         message_id = obj['message_id']
-        fromUser = User.de_json(json.dumps(obj['from']))
+        from_user = User.de_json(json.dumps(obj['from']))
         chat = Message.parse_chat(obj['chat'])
         date = obj['date']
         content_type = None
@@ -88,7 +88,7 @@ class Message:
         if 'location' in obj:
             opts['location'] = Location.de_json(json.dumps(obj['location']))
             content_type = 'location'
-        return Message(message_id, fromUser, date, chat, content_type, opts)
+        return Message(message_id, from_user, date, chat, content_type, opts)
 
     @classmethod
     def parse_chat(cls, chat):
@@ -262,7 +262,7 @@ class UserProfilePhotos:
 
 
 class ReplyKeyboardMarkup:
-    def __init__(self, keyboard=[], resize_keyboard=None, one_time_keyboard=None, selective=None, row_width=3):
+    def __init__(self, resize_keyboard=None, one_time_keyboard=None, selective=None, row_width=3):
         self.resize_keyboard = resize_keyboard
         self.one_time_keyboard = one_time_keyboard
         self.selective = selective
@@ -307,15 +307,14 @@ class ReplyKeyboardMarkup:
         https://core.telegram.org/bots/api#replykeyboardmarkup
         :return:
         """
-        json_dict = {}
-        json_dict['keyboard'] = self.keyboard
-        if self.one_time_keyboard != False:
+        json_dict = {'keyboard': self.keyboard}
+        if self.one_time_keyboard:
             json_dict['one_time_keyboard'] = True
 
-        if self.resize_keyboard != False:
+        if self.resize_keyboard:
             json_dict['resize_keyboard'] = True
 
-        if self.selective != False:
+        if self.selective:
             json_dict['selective'] = True
 
         return json.dumps(json_dict)
diff --git a/tests/test_types.py b/tests/test_types.py
index cb5887e..e548145 100644
--- a/tests/test_types.py
+++ b/tests/test_types.py
@@ -34,7 +34,7 @@ def test_json_GroupChat():
 def test_json_Document():
     json_string = r'{"file_name":"Text File","thumb":{},"file_id":"BQADBQADMwIAAsYifgZ_CEh0u682xwI","file_size":446}'
     doc = types.Document.de_json(json_string)
-    assert doc.thumb == None
+    assert doc.thumb is None
     assert doc.file_name == 'Text File'