python怎么实现邮件收发功能的代码

实现邮件收发功能的代码，需要使用 Python 的 `smtplib` 和 `email` 库。以下是一个简单的例子：

import smtplib
from email.mime.text import MIMEText
from email.mime.multipart import MIMEMultipart
from email.mime.application import MIMEApplication

# 发件人邮箱账号
sender = 'your_email@example.com'
# 发件人邮箱密码
password = 'your_email_password'
# 收件人邮箱账号
receiver = 'recipient_email@example.com'

# 创建邮件对象
msg = MIMEMultipart()

# 设置邮件主题、发件人、收件人
subject = 'Python Email Test'
msg['Subject'] = subject
msg['From'] = sender
msg['To'] = receiver

# 添加邮件正文
body = 'This is a test email sent from Python.'
msg.attach(MIMEText(body, 'plain'))

# 添加附件
filename = 'test.txt'
with open(filename, 'rb') as f:
    attachment = MIMEApplication(f.read(), _subtype='txt')
    attachment.add_header('Content-Disposition', 'attachment', filename=filename)
    msg.attach(attachment)

# 发送邮件
try:
    smtpObj = smtplib.SMTP('smtp.example.com', 25)
    smtpObj.login(sender, password)
    smtpObj.sendmail(sender, receiver, msg.as_string())
    print('邮件发送成功')
except smtplib.SMTPException as e:
    print('邮件发送失败：', e)
finally:
    smtpObj.quit()

需要将 `your_email@example.com` 和 `your_email_password` 替换为实际的发件人邮箱地址和密码，将 `recipient_email@example.com` 替换为实际的收件人邮箱地址，将 `smtp.example.com` 替换为实际的 SMTP 服务器地址。此外，如果需要添加附件，需要将 `test.txt` 替换为实际的附件文件名。