Alchemy.Events.on_ready

You're seeing just the macro on_ready, go back to Alchemy.Events module for more information.
Link to this macro

on_ready(func)

(macro)

Registers a handle triggering whenever a shard receives a READY event.

This event gets sent after a shard connects with the gateway, filling the cache with info about the guilds the bot is in.

args : Integer, Integer Receives the shard number (starting at 0), and the total amount of shards.

After this event has been received, most of the information in the cache should be failed.