New submission from Xavier Bonaventura <xavibonavent...@gmail.com>:
The behavior when you assign an email to 'To' is counter intuitive.
When you do:
msg['To'] = 'f...@mail.com'
this appends the email instead of really assigning it.
This is because the assignment operator is overwritten.
Imagine that you have code like this:
msg = MIMEText("The report at *link* has been updated")
for recipient in recipient_list:
msg['To'] = recipient_email
server.sendmail(from_address, recipient_email, msg.as_string())
This will send the email to the first person N times, to the second N-1, etc.
In case that you want to debug, it is also a problem. In case that the append
is the expected behaviour, one would expect that at least if you do a print
like this you see the full list.
print(msg['To'])
Instead of that, in this example of code:
msg['To'] = 'f...@mail.com'
msg['To'] = 'f...@mail.com'
print(msg['To'])
It will print:
f...@mail.com
But the message will be sent two times.
----------
components: Library (Lib)
messages: 317550
nosy: Xavier Bonaventura
priority: normal
severity: normal
status: open
title: smtplib msg['To] = appends instead of assigning
type: behavior
versions: Python 2.7
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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue33633>
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