使用Python的email.MIMEBase模块发送带有附件的邮件

发送带有附件的邮件使用Python的email模块是非常简单的。首先，我们需要导入需要的模块：

import smtplib
from email.mime.multipart import MIMEMultipart
from email.mime.base import MIMEBase
from email import encoders

接下来，我们需要设置一些基本的参数，如发送者、收件人、主题和身份验证信息：

fromaddr = "sender@gmail.com"
toaddr = "receiver@gmail.com"
subject = "Testing Email with Attachment"
username = "your_username"
password = "your_password"

然后，我们可以创建一个MIMEMultipart对象来表示整个邮件，并设置一些基本的信息：

msg = MIMEMultipart()

msg['From'] = fromaddr
msg['To'] = toaddr
msg['Subject'] = subject

接下来，我们可以添加正文内容到邮件中：

body = "This is the body of the email"
msg.attach(MIMEText(body, 'plain'))

然后，我们可以打开要添加为附件的文件，并将其添加到邮件中：

attachment = open("path_to_attachment_file", "rb")

part = MIMEBase('application', 'octet-stream')
part.set_payload((attachment).read())
encoders.encode_base64(part)
part.add_header('Content-Disposition', "attachment; filename= %s" % filename)

msg.attach(part)

最后，我们可以使用smtplib模块来发送邮件：

server = smtplib.SMTP('smtp.gmail.com', 587)
server.starttls()
server.login(username, password)
text = msg.as_string()
server.sendmail(fromaddr, toaddr, text)
server.quit()

下面是一个完整的例子，演示如何使用email模块发送带有附件的邮件：

import smtplib
from email.mime.multipart import MIMEMultipart
from email.mime.text import MIMEText
from email.mime.base import MIMEBase
from email import encoders

fromaddr = "sender@gmail.com"
toaddr = "receiver@gmail.com"
subject = "Testing Email with Attachment"
username = "your_username"
password = "your_password"

msg = MIMEMultipart()
msg['From'] = fromaddr
msg['To'] = toaddr
msg['Subject'] = subject

body = "This is the body of the email"
msg.attach(MIMEText(body, 'plain'))

filename = "attachment.pdf"
attachment = open("path_to_attachment_file", "rb")

part = MIMEBase('application', 'octet-stream')
part.set_payload((attachment).read())
encoders.encode_base64(part)
part.add_header('Content-Disposition', "attachment; filename= %s" % filename)

msg.attach(part)

server = smtplib.SMTP('smtp.gmail.com', 587)
server.starttls()
server.login(username, password)
text = msg.as_string()
server.sendmail(fromaddr, toaddr, text)
server.quit()

请确保将sender@gmail.com和receiver@gmail.com替换为实际的发送者和接收者的电子邮件地址。同时，也要将your_username和your_password替换为您的SMTP服务器的用户名和密码。

以上就是使用Python的email.MIMEBase模块发送带有附件的邮件的例子。您可以根据自己的需求进行修改和扩展。