Tying it all together

Let us tie this chapter together with a more complex example. The following is the code for the EmailAction class. This action sends an e-mail to the user when the rule is matched.

import smtplib
from email.mime.text import MIMEText

class EmailAction:
    """Send an email when a rule is matched"""
    from_email = "alerts@stocks.com"

    def __init__(self, to):
        self.to_email = to

    def execute(self, content):
        message = MIMEText(content)
        message["Subject"] = "New Stock Alert"
        message["From"] = "alerts@stocks.com"
        message["To"] = self.to_email
        smtp = smtplib.SMTP("email.stocks.com")

The following is how the library works:

  1. We instantiate the SMTP class in the smtplib library, passing it the ...

Get Test-Driven Python Development now with O’Reilly online learning.

O’Reilly members experience live online training, plus books, videos, and digital content from 200+ publishers.