New submission from Lukas J <[email protected]>:
When converting an email.message.Message with the policy set to
email.policy.EmailPolicy with all default settings, I eventually end up with
this exception:
File "/usr/lib/python3.7/email/_header_value_parser.py", line 2727, in
_fold_as_ew
first_part = to_encode[:text_space]
TypeError: slice indices must be integers or None or have an __index__ method
Which is caused because text_space is a float of value +inf. This is set on
line 2594 of the same file: maxlen = policy.max_line_length or float("+inf")
For some reason policy.max_line_length is set to zero, even though the default
should be 78 after a glance into the source.
So there's maybe even two issues:
1.) The fallback for maxlen shouldn't be float("+inf"), as that is not an
integer and thus can't be sliced by. I think a big integer would suffice
instead, for example 100000000
2.) policy.max_line_length seems to lose it's value in the default settings
somewhere along the way if it isn't explicitly set.
Current workaround:
Set max_line_length of the policy to a value (78 is default)
----------
components: email
messages: 335424
nosy: Lukas J, barry, r.david.murray
priority: normal
severity: normal
status: open
title: Folding tries to slice from 0 to float("+inf") when maxlength is 0
versions: Python 3.7
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Python tracker <[email protected]>
<https://bugs.python.org/issue35985>
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