用Python发送模版邮件

config_tool.py

import os

class ConfigTool:
    def __init__(self):
        # Load configurations from environment variables into the global dictionary.
        self._config_dict = {key: os.environ[key] for key in os.environ}

    def get(self, key, default=None):
        """Retrieve value by key from the configuration dictionary."""
        return self._config_dict.get(key, default)

# Usage example:
config = ConfigTool()
db_host = config.get('DB_HOST', 'default_host')  # This tries to get the 'DB_HOST' value, and if it doesn't exist, returns 'default_host'.

data.json

{
    "name": "Alice",
    "task": "Finish the report",
    "status": "Completed"
}

email_notify.py

import smtplib
from email.message import EmailMessage
import json

class EmailNotifier:
    def __init__(self, smtp_server, smtp_port, email, password, sender_alias=None):
        self.smtp_server = smtp_server
        self.smtp_port = smtp_port
        self.email = email
        self.password = password
        self.sender_alias = sender_alias

    def send_email(self, to_email):
        # Load data from data.json
        with open("data.json", "r") as f:
            data = json.load(f)
        
        # Load email template
        with open("email_template.txt", "r") as f:
            template = f.read()

        # Replace placeholders with actual data
        email_content = template.format(**data)

        # Create email message
        msg = EmailMessage()
        msg.set_content(email_content)
        msg["Subject"] = "TODO List Task Status Update"
        
        # Check if a sender alias is provided
        from_header = f"{self.sender_alias} <{self.email}>" if self.sender_alias else self.email
        msg["From"] = from_header
        
        msg["To"] = to_email

        # Send email
        with smtplib.SMTP_SSL(self.smtp_server, self.smtp_port) as server:
            server.login(self.email, self.password)
            server.send_message(msg)

# Usage
notifier = EmailNotifier("smtp.example.com", 465, "youremail@example.com", "yourpassword", "TodoApp")
notifier.send_email("recipient@example.com")

email_template.txt

Hello {name},

Your task "{task}" has changed its status to {status}.

Best,
Your TODO List App