帮我用python写一段收发邮件的代码，收邮件为检索某一标题的邮件是否出现，未出现返回False，出现返回(True,邮件内容)的代码并封装

好的，以下是收发邮件的代码，其中包括一个函数 `search_email`，用于搜索包含特定标题的邮件。如果找到了这样的邮件，则返回一个元组 `(True, 邮件内容)`，否则返回 `False`。

import imaplib
import email
from email.header import decode_header
import smtplib
from email.mime.text import MIMEText


class EmailClient:
    def __init__(self, imap_server, smtp_server, username, password):
        self.imap_server = imap_server
        self.smtp_server = smtp_server
        self.username = username
        self.password = password

    def search_email(self, search_subject):
        # log in to the IMAP server
        imap = imaplib.IMAP4_SSL(self.imap_server)
        imap.login(self.username, self.password)
        imap.select('INBOX')

        # search for emails with the given subject
        result, data = imap.search(None, f'SUBJECT "{search_subject}"')
        if result != 'OK':
            return False

        # get the latest email with the given subject
        latest_email_id = data[0].split()[-1]
        result, data = imap.fetch(latest_email_id, "(RFC822)")
        if result != 'OK':
            return False

        # parse the email content
        email_message = email.message_from_bytes(data[0][1])
        subject = decode_header(email_message["Subject"])[0][0]
        body = email_message.get_payload(decode=True).decode()

        # log out of the IMAP server
        imap.close()
        imap.logout()

        return True, body

    def send_email(self, to_email, subject, body):
        # log in to the SMTP server
        smtp = smtplib.SMTP_SSL(self.smtp_server)
        smtp.login(self.username, self.password)

        # create the email message
        message = MIMEText(body)
        message['From'] = self.username
        message['To'] = to_email
        message['Subject'] = subject

        # send the email
        smtp.sendmail(self.username, [to_email], message.as_string())

        # log out of the SMTP server
        smtp.quit()


if __name__ == '__main__':
    # create an email client object
    email_client = EmailClient(
        'imap.example.com',
        'smtp.example.com',
        'your_username',
        'your_password'
    )

    # search for an email with the given subject
    search_subject = 'Test Email'
    result = email_client.search_email(search_subject)
    if result:
        print(f'Found email with subject "{search_subject}":\n{result[1]}')
    else:
        print(f'No email found with subject "{search_subject}"')

你可以将 `EmailClient` 类实例化，然后使用其中的 `search_email` 和 `send_email` 方法来搜索邮件和发送邮件。例如，下面的代码将创建一个 `EmailClient` 对象并向 `to_email` 发送一封主题为 `subject`，正文为 `body` 的电子邮件：

email_client = EmailClient(imap_server, smtp_server, username, password)
email_client.send_email(to_email, subject, body)

希望这可以帮到你！