在Python電子郵件中附加文件

Question

因此，我嘗試了多種方法將文件（尤其是CSV文件）附加到python中的電子郵件並發送。 我的文本電子郵件正常工作，我確實收到了一個CSV文件，只是一個空文件。 我目前正在發送附件，如下所示：

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'

這類似於此處的答案： python無法通過電子郵件發送附件文件我也嘗試過類似以下的簡單方法： 如何使用Python發送電子郵件附件 https://docs.python.org/2/library/email.html

和其他，但沒有成功。 如何發送完整的附件？

Answer 1

因此，經過大量調試后，我意識到在嘗試再次讀取該文件以構成電子郵件之前，我沒有正確關閉該文件。 我有類似下面的代碼：

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.

為了解決這個問題，我只是簡單地在with語句之外調用了我的email函數來關閉文件。

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

send_the_email()

我希望這可以防止其他人像我一樣浪費時間在簡單的事情上。

Answer 2

嘗試這樣編輯此部分

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