R. David Murray <rdmur...@bitdance.com> added the comment:
smtplib doesn't define any behavior for messages. I presume you are talking
about the email library?
Vis the print behavior, dict-style lookup is defined to return the first
matching header. If you want to see all of them, you can use get_all. For
debugging, you should print the whole message, which would show the duplicate
headers:
>>> from email.message import Message
>>> msg = Message()
>>> msg['To'] = 'a...@xyz.com'
>>> msg['To'] = 'x...@abc.com'
>>> print(msg)
To: a...@xyz.com
To: x...@abc.com
With the new API this is better, at least in terms of debugging:
>>> from email.message import EmailMessage
>>> msg = EmailMessage()
>>> msg['To'] = 'a...@xyz.com'
>>> print(msg)
To: a...@xyz.com
>>> msg['To'] = 'x...@abc.com'
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/home/rdmurray/python/p38/Lib/email/message.py", line 408, in
__setitem__
"in a message".format(max_count, name))
ValueError: There may be at most 1 To headers in a message
This can't be changed in the old API for backward compatibility reasons.
----------
nosy: +r.david.murray
resolution: -> out of date
stage: -> resolved
status: open -> closed
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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue33633>
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