在发送附件的电子邮件后如何关闭文件？
我有一个循环，该循环在电子邮件列表中向人们发送带有附件的电子邮件。问题是，当涉及到列表中的最后一个人时，我在电子邮件中附加的文件仍然保留在Windows中。
for index, row in f.iterrows():
print (row["ManagerEmail"]+row["filename"])
msg = MIMEMultipart()
msg['From'] = fromaddr
msg['Subject'] = row["filename"] + f" Sales Letter"
msg.attach(MIMEText(body, 'plain'))
filename = row["filename"]
toaddr = row["ManagerEmail"]
attachment = open(row["filepath"], "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)
text = msg.as_string()
server.sendmail(fromaddr, toaddr, text)
以某种方式，我需要在末尾放置一个参数才能关闭文件，但我不知道该怎么做。
I have a loop which sends email with an attachment to the people in emailing list. The problem is, when it comes to the last person in the list, the file I am attaching on email still stays as in use in Windows.
for index, row in f.iterrows():
print (row["ManagerEmail"]+row["filename"])
msg = MIMEMultipart()
msg['From'] = fromaddr
msg['Subject'] = row["filename"] + f" Sales Letter"
msg.attach(MIMEText(body, 'plain'))
filename = row["filename"]
toaddr = row["ManagerEmail"]
attachment = open(row["filepath"], "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)
text = msg.as_string()
server.sendmail(fromaddr, toaddr, text)
Somehow I need to put a parameter at the end to close the file but I do not know how to do that.
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就像您使用
Open（）打开文件一样，您需要使用CLOSE（）将其关闭如
attactment.close（）。或者，更好的是，使用上下文管理器：上下文管理器保证，用块在
之外关闭文件。Just like you open a file with
open()you need to close it withclose()As in
attachment.close(). Or, even better, use context manager:Context managers guarantee that file will be closed outside of the
withblock.