I am making a slack bot. I have been using python slackclient library to develop the bot. Its working great with one team. I am using Flask Webframework.
As many people add the app to slack via "Add to Slack" button, I get their bot_access_token.
Now
how should I run the code with so many Slack tokens. Should I store them in a list and then traverse using for loops for all token! But this was is not good as I may not be able to handle the simultaneous messages or events I receive Or "its a good way".
Any other way if its not?
You do indeed need to

Store each team token. Please remember to encrypt it
When a team installs your app, create a new RTM connection. When your app/server restarts, loop across all your teams, open a RTM connection for each of them
each connection will receive events from that team, and that team only. You will not receive all notifications on the same connection 

(maybe you are coming from Facebook Messenger bots background, where all notifications arrive at the same webhook ? That's not the case with Slack)
How to handle many users in slack app for in Python? How to use the multiple tokens?