解析电子邮件标题的最小程序是什么？

import imaplib
import email

# 登录邮箱
mail = imaplib.IMAP4_SSL("imap.example.com")
mail.login("username", "password")

# 选择邮箱文件夹
mail.select("inbox")

# 搜索邮件
typ, data = mail.search(None, "ALL")
mail_ids = data[0].split()

# 获取最新邮件
latest_email_id = mail_ids[-1]
typ, msg_data = mail.fetch(latest_email_id, "(RFC822)")
msg = email.message_from_bytes(msg_data[0][1])

# 解析邮件标题
subject = email.header.decode_header(msg["Subject"])[0][0].decode()

# 将邮件标题解析为字典
title_dict = {}
for word in subject.split():
    if ":" in word:
        key, value = word.split(":")
        title_dict[key] = value

print(title_dict)