Fix instances of empty strings in __init__

Should partially fix #460

telegram/audio.py

@@ -46,9 +46,9 @@ class Audio(TelegramObject):
     def __init__(self,
                  file_id,
                  duration,
-                 performer='',
-                 title='',
-                 mime_type='',
+                 performer=None,
+                 title=None,
+                 mime_type=None,
                  file_size=0,
                  **kwargs):
         # Required
@@ -57,7 +57,8 @@ class Audio(TelegramObject):
         # Optionals
         self.performer = performer
         self.title = title
-        self.mime_type = str(mime_type)
+        if mime_type:
+            self.mime_type = str(mime_type)
         self.file_size = int(file_size)
 
     @staticmethod

telegram/chat.py

@@ -53,10 +53,10 @@ class Chat(TelegramObject):
     def __init__(self,
                  id,
                  type,
-                 title='',
-                 username='',
-                 first_name='',
-                 last_name='',
+                 title=None,
+                 username=None,
+                 first_name=None,
+                 last_name=None,
                  all_members_are_admins=False,
                  bot=None,
                  **kwargs):

telegram/contact.py

@@ -39,7 +39,7 @@ class Contact(TelegramObject):
 
     """
 
-    def __init__(self, phone_number, first_name, last_name='', user_id=0, **kwargs):
+    def __init__(self, phone_number, first_name, last_name=None, user_id=0, **kwargs):
         # Required
         self.phone_number = str(phone_number)
         self.first_name = first_name

telegram/document.py

@@ -41,13 +41,14 @@ class Document(TelegramObject):
 
     """
 
-    def __init__(self, file_id, thumb=None, file_name='', mime_type='', file_size=0, **kwargs):
+    def __init__(self, file_id, thumb=None, file_name=None, mime_type=None, file_size=0, **kwargs):
         # Required
         self.file_id = str(file_id)
         # Optionals
         self.thumb = thumb
         self.file_name = file_name
-        self.mime_type = str(mime_type)
+        if mime_type:
+            self.mime_type = str(mime_type)
         self.file_size = int(file_size)
 
     @staticmethod

telegram/file.py

@@ -40,13 +40,14 @@ class File(TelegramObject):
 
     """
 
-    def __init__(self, file_id, bot, file_size=0, file_path='', **kwargs):
+    def __init__(self, file_id, bot, file_size=0, file_path=None, **kwargs):
         # Required
         self.file_id = str(file_id)
 
         # Optionals
         self.file_size = int(file_size)
-        self.file_path = str(file_path)
+        if file_path:
+            self.file_path = str(file_path)
 
         self.bot = bot
 

telegram/game.py

@@ -48,7 +48,7 @@ class Game(TelegramObject):
                  title,
                  description,
                  photo,
-                 text='',
+                 text=None,
                  text_entities=None,
                  animation=None,
                  **kwargs):

telegram/message.py

@@ -117,7 +117,7 @@ class Message(TelegramObject):
                  forward_date=None,
                  reply_to_message=None,
                  edit_date=None,
-                 text='',
+                 text=None,
                  entities=None,
                  audio=None,
                  document=None,
@@ -125,13 +125,13 @@ class Message(TelegramObject):
                  sticker=None,
                  video=None,
                  voice=None,
-                 caption='',
+                 caption=None,
                  contact=None,
                  location=None,
                  venue=None,
                  new_chat_member=None,
                  left_chat_member=None,
-                 new_chat_title='',
+                 new_chat_title=None,
                  new_chat_photo=None,
                  delete_chat_photo=False,
                  group_chat_created=False,

telegram/sticker.py

@@ -44,7 +44,7 @@ class Sticker(TelegramObject):
         file_size (Optional[int]):
     """
 
-    def __init__(self, file_id, width, height, thumb=None, emoji='', file_size=0, **kwargs):
+    def __init__(self, file_id, width, height, thumb=None, emoji=None, file_size=0, **kwargs):
         # Required
         self.file_id = str(file_id)
         self.width = int(width)

telegram/user.py

@@ -44,7 +44,14 @@ class User(TelegramObject):
         bot (Optional[Bot]): The Bot to use for instance methods
     """
 
-    def __init__(self, id, first_name, type='', last_name='', username='', bot=None, **kwargs):
+    def __init__(self,
+                 id,
+                 first_name,
+                 type=None,
+                 last_name=None,
+                 username=None,
+                 bot=None,
+                 **kwargs):
         # Required
         self.id = int(id)
         self.first_name = first_name

telegram/video.py

@@ -52,7 +52,7 @@ class Video(TelegramObject):
                  height,
                  duration,
                  thumb=None,
-                 mime_type='',
+                 mime_type=None,
                  file_size=0,
                  **kwargs):
         # Required
@@ -62,7 +62,8 @@ class Video(TelegramObject):
         self.duration = int(duration)
         # Optionals
         self.thumb = thumb
-        self.mime_type = str(mime_type)
+        if mime_type:
+            self.mime_type = str(mime_type)
         self.file_size = int(file_size)
 
     @staticmethod

telegram/voice.py

@@ -40,12 +40,13 @@ class Voice(TelegramObject):
         file_size (Optional[int]):
     """
 
-    def __init__(self, file_id, duration, mime_type='', file_size=0, **kwargs):
+    def __init__(self, file_id, duration, mime_type=None, file_size=0, **kwargs):
         # Required
         self.file_id = str(file_id)
         self.duration = int(duration)
         # Optionals
-        self.mime_type = str(mime_type)
+        if mime_type:
+            self.mime_type = str(mime_type)
         self.file_size = int(file_size)
 
     @staticmethod