Update examples

examples/welcome_bot.py

@@ -1,52 +1,32 @@
-from pyrogram import Client, Emoji
-from pyrogram.api import types
+from pyrogram import Client, Emoji, Filters
 
 """
 This is the Welcome Bot in @PyrogramChat
-The code is commented to help you understand each part
-
-It also uses the Emoji module to easily add emojis in your text messages
+It uses the Emoji module to easily add emojis in your text messages and Filters
+to make it only work for specific messages in a specific chat 
 """
 
-# Your Supergroup ID
-SUPERGROUP_ID = 1387666944
+app = Client("my_account")
 
 
-def update_handler(client, update, users, chats):
-    # Supergroup messages are contained in the "UpdateNewChannelMessage" update type
-    if isinstance(update, types.UpdateNewChannelMessage):
-        message = update.message
-        # When a user joins, a "MessageService" is received
-        if isinstance(message, types.MessageService):
-            # Check if the message is sent to your SUPERGROUP_ID
-            if message.to_id.channel_id == SUPERGROUP_ID:
-                # A "MessageService" contains the "action" field.
-                # The action for user joins is "MessageActionChatAddUser" if the user
-                # joined using the username, otherwise is "MessageActionChatJoinedByLink" if
-                # the user joined a private group by link
-                if isinstance(message.action, (types.MessageActionChatAddUser, types.MessageActionChatJoinedByLink)):
-                    # Now send the welcome message. Extra info about a user (such as the first_name, username, ...)
-                    # are contained in the users dictionary and can be accessed by the user ID
-                    client.send_message(
-                        SUPERGROUP_ID,
-                        "{} Welcome to [Pyrogram](https://docs.pyrogram.ml/)'s "
-                        "group chat, [{}](tg://user?id={})!".format(
-                            Emoji.SPARKLES,  # Add an emoji
-                            users[message.from_id].first_name,
-                            users[message.from_id].id
-                        ),
-                        reply_to_message_id=message.id,
-                        disable_web_page_preview=True
-                    )
+@app.on_message(Filters.chat("PyrogramChat") & Filters.new_chat_members)
+def welcome(client, message):
+    new_members = ", ".join([
+        "[{}](tg://user?id={})".format(i.first_name, i.id)
+        for i in message.new_chat_members]
+    )
+
+    text = "{} Welcome to [Pyrogram](https://docs.pyrogram.ml/)'s group chat {}!".format(
+        Emoji.SPARKLES,
+        new_members
+    )
+
+    client.send_message(
+        message.chat.id, text,
+        reply_to_message_id=message.message_id,
+        disable_web_page_preview=True
+    )
 
 
-def main():
-    client = Client("example")
-    client.set_update_handler(update_handler)
-
-    client.start()
-    client.idle()
-
-
-if __name__ == "__main__":
-    main()
+app.start()
+app.idle()