W. Trevor King added the comment:
Here's an example from the notmuch list. You can trigger the exception in
Python 3.4 with:
>>> import email.policy
>>> import mailbox
>>> mbox = mailbox.mbox('msg.mbox', factory=None, create=False)
>>> message = mbox[0]
>>> message.as_bytes(policy=email.policy.SMTP)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/home/wking/src/notmuch/ssoma_mda.py", line 319, in deliver
message_bytes = message.as_bytes(policy=_email_policy.SMTP)
File "/usr/lib64/python3.4/email/message.py", line 179, in as_bytes
g.flatten(self, unixfrom=unixfrom)
File "/usr/lib64/python3.4/email/generator.py", line 112, in flatten
self._write(msg)
File "/usr/lib64/python3.4/email/generator.py", line 192, in _write
self._write_headers(msg)
…
File "/usr/lib64/python3.4/email/_header_value_parser.py", line 195, in
<genexpr>
return ''.join(str(x) for x in self)
RuntimeError: maximum recursion depth exceeded while getting the str of an
object
Interestingly, it serializes fine using the default policy:
>>> message.as_bytes()
b'Return-Path: …-----\n'
----------
nosy: +labrat
Added file: http://bugs.python.org/file37143/msg.mbox
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