Question

所以我尝试了多种方法将文件（特别是CSV文件）附加到python中的电子邮件并发送。我的文本电子邮件工作正常，我确实收到一个CSV文件，只是一个空文件。我目前正在发送我的附件：

ctype, encoding = mimetypes.guess_type("results.csv")
if ctype is None or encoding is not None:
    ctype = "application/octet-stream"

maintype, subtype = ctype.split("/", 1)

# organizing receivers
receiver = receivers.split(',')

# creating subject
subject = 'BLAH BLAH'
timestamp = time.strftime("%m/%d/%Y:%H:%M:%S")
subject += str(timestamp)

# form email
msg = MIMEMultipart()
msg['From'] = sender
msg['To'] = " ".join(receivers)
msg['Subject'] = subject
msg['Message-Id'] = make_msgid()
msg['Date'] = formatdate(localtime=True)
msg.attach(MIMEText(msgstr, 'plain'))

if maintype == "text":
    fp = open("results.csv")
    attachment = MIMEText(fp.read(), _subtype=subtype)
    fp.close()

else:
    fp = open('results.csv', "rb")
    attachment = MIMEBase(maintype, subtype)
    attachment.set_payload(fp.read())
    fp.close()
    encoders.encode_base64(attachment)

attachment.add_header("Content-Disposition", "attachment", filename='results.csv')
msg.attach(attachment)

try:
    smtpobj = smtplib.SMTP('smtp.gmail.com:587')
    smtpobj.ehlo()
    smtpobj.starttls()
    smtpobj.ehlo()
    smtpobj.login(username, password)

    smtpobj.sendmail(sender, receiver, msg.as_string())
    smtpobj.quit()

except smtplib.SMTPException:
    print 'Error: unable to send mail'

这与答案类似：python can't send attachment files through email 我也尝试过类似的简单方法： How to send email attachments with Python https://docs.python.org/2/library/email.html

和其他人，但没有成功。如何发送完整的附件？

Answer 1

因此经过多次调试后，我意识到我没有正确关闭文件，然后再尝试再次阅读该文件的电子邮件组成。我有类似下面的代码：

with open('results.csv', "rb") as csvfile:
    #compose the csv file
    #blah
    #blah
    #blah
    #then I called my email function but the file hadn't yet been closed and I was trying to reopen.

要解决此问题，我只需在with语句之外调用我的电子邮件功能即可关闭该文件。

with open('results.csv', "rb") as csvfile:
        #compose the csv file
        #blah
        #blah
        #blah

send_the_email()

我希望这可以防止他人像我一样浪费那么多时间，就这么简单。

Answer 2

尝试编辑此部分

else:
    with open('results.csv', "rb") as fp:
        fp.seek(0)
        attachment = MIMEBase(maintype, subtype)
        attachment.set_payload(fp.read())
        encoders.encode_base64(attachment)

在Python电子邮件中附加文件

2 个答案: