Question

用python发送png格式的附件，收到的时候变成了bin格式，是为什么呢？

# !/usr/bin/env python3
# -*- coding: utf-8 -*-
from email import encoders
from email.header import Header
from email.mime.multipart import MIMEMultipart
from email.mime.text import MIMEText
from email.mime.base import MIMEBase
from email.utils import parseaddr,formataddr

import smtplib

def _format_addr(s):
name, addr = parseaddr(s)
return formataddr((Header(name, 'utf-8').encode(), addr))

from_addr = input('From: ')
password = input('Password: ')
to_addr = input('To: ')
smtp_server = input('SMTP server: ')

# 邮件对象:
msg = MIMEMultipart()
msg['From'] = _format_addr('Python爱好者 <%s>' % from_addr)
msg['To'] = _format_addr('管理员 <%s>' % to_addr)
msg['Subject'] = Header('来自SMTP的问候……', 'utf-8').encode()

# 邮件正文是MIMEText：
msg.attach(MIMEText('send with file...', 'plain', 'utf-8'))

# 添加附件就是加上一个MIMEBase，从本地读取一个图片:
with open('C:/Users/jx/Desktop/1.png', 'rb') as f:
# 设置附件的MIME和文件名，这里是png类型:
mime = MIMEBase('image', 'png', filename='1.PNG')
# 加上必要的头信息:
mime.add_header('Context-Disposition', 'attachment', filename='1.PNG')
mime.add_header('Content-ID', '<0>')
mime.add_header('X-Attachment-Id', '0')
# 把附件的内容读进来:
mime.set_payload(f.read())
# 用Base64编码:
encoders.encode_base64(mime)
# 添加到MIMEMultipart
msg.attach(mime)

server = smtplib.SMTP(smtp_server, 25)
server.set_debuglevel(1)
server.login(from_addr, password)
server.sendmail(from_addr, [to_addr], msg.as_string())
server.quit()
读取到的附件变成了tcmime.2154.2341.36672.bin
求问各位大神是什么原因？

Answer 1

img["Content-Disposition"] = 'attachment,filename="hdrCount.txt"'这行改为：
img["Content-Disposition"] = 'attachment,filename=%s' % string.encode("uff-8")
也就是说对你发送的内容需要进行uft-8编码。