[issue35985] Folding tries to slice from 0 to float("+inf") when maxlength is 0

[Karthikeyan Singaravelan]

Change by Karthikeyan Singaravelan :


--
superseder:  -> non-ascii characters in headers causes TypeError on 
email.policy.Policy.fold

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[issue35985] Folding tries to slice from 0 to float("+inf") when maxlength is 0

[Stéphane Wirtel]

Stéphane Wirtel  added the comment:

Just add the link to the other issue: https://bugs.python.org/issue33524

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[issue35985] Folding tries to slice from 0 to float("+inf") when maxlength is 0

[Lukas J]

Lukas J  added the comment:

Ok thank you!

--
resolution:  -> duplicate
stage:  -> resolved
status: open -> closed

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[issue35985] Folding tries to slice from 0 to float("+inf") when maxlength is 0

[Karthikeyan Singaravelan]

Karthikeyan Singaravelan  added the comment:

Thanks for the confirmation. I would propose closing this as a duplicate. The 
PR on the other issue might fix your issue and is just waiting on a NEWS entry.

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[issue35985] Folding tries to slice from 0 to float("+inf") when maxlength is 0

[Lukas J]

Lukas J  added the comment:

Minimal example:


import email.policy
import email.mime.text

responsehtml = "somehtmlbody"

msg = email.mime.text.MIMEText(responsehtml, "html", 
policy=email.policy.EmailPolicy())

msg["to"] = "t...@example.com"
msg["cc"] = "äöü "
msg["From"] = "f...@bar.com"
msg["Subject"] = "test"

msg.as_string()

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[issue35985] Folding tries to slice from 0 to float("+inf") when maxlength is 0

[Stéphane Wirtel]

Stéphane Wirtel  added the comment:

Could you share your example?

Thank you

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nosy: +matrixise

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[issue35985] Folding tries to slice from 0 to float("+inf") when maxlength is 0

[Lukas J]

Lukas J  added the comment:

Indeed it is. Sorry I didn't find it before.

So it seems that changing float("+inf") to sys.maxsize would solve the problem? 
I've tried it in an interactive shell:

>>> a = "asd"; import sys
>>> a[:sys.maxsize]
'asd'

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[issue35985] Folding tries to slice from 0 to float("+inf") when maxlength is 0

[Karthikeyan Singaravelan]

Karthikeyan Singaravelan  added the comment:

This seems to be same as issue33524 ?

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nosy: +xtreak

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[issue35985] Folding tries to slice from 0 to float("+inf") when maxlength is 0

[Lukas J]

New submission from Lukas J :

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 1

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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