Notification bot for Steem in 30 lines of code

Dear Steemians,

since the upvote bot was not received well, I'd like to present another
way of using the piston library for bots:

A @-notification bot in 30 lines of code

from piston.steem import Steem
import os
import json
import sendgrid
steem = Steem()
sg = sendgrid.SendGridClient(
    os.environ['SENDGRID_USERNAME'],
    os.environ['SENDGRID_PASSWORD']
)
message = sendgrid.Mail()
addresses = {"xeroc": "mail@xeroc.org"}
# addresses = os.environ["ADDRESSES"]
for c in steem.stream_comments(start=1898900):
    for user in addresses.keys():
        if "@%s" % user in c["body"]:
            message.add_to(addresses[user])
            message.set_subject('Notification on Steem')
            message.set_text(
                "You have been messaged by %s " % (c["author"]) +
                "in the post @%s/%s" % (c["author"], c["permlink"]) +
                "\n\n" + 
                "You can read the post on Steemit.com:\n" +
                "http://steemit.com/%s/%s#@%s/%s"
                    % (c["category"],
                       c["openingPostIdentifier"],
                       c["author"], c["permlink"])
            )
            message.set_from('notify@steem')
            status, msg = sg.send(message)
            print("\nMessage sent!\n")

Note

This currently requries that you install the python-steem library as well as piston from the development branch.

Have fun!