Implement thr UTF8 command (RFC 6856) in poplib.

[zvyn]

BPO	21804
Nosy	@warsaw, @pitrou, @bitdancer, @zvyn
Files	poputf8.patch poputf8-v2.patch

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2015-05-16.19:07:32.964>
created_at = <Date 2014-06-18.23:14:44.487>
labels = ['type-feature', 'expert-email']
title = 'Implement thr UTF8 command (RFC 6856) in poplib.'
updated_at = <Date 2015-05-16.19:07:32.963>
user = 'https://github.com/zvyn'

bugs.python.org fields:

activity = <Date 2015-05-16.19:07:32.963>
actor = 'r.david.murray'
assignee = 'none'
closed = True
closed_date = <Date 2015-05-16.19:07:32.964>
closer = 'r.david.murray'
components = ['email']
creation = <Date 2014-06-18.23:14:44.487>
creator = 'zvyn'
dependencies = []
files = ['35687', '35823']
hgrepos = []
issue_num = 21804
keywords = ['patch']
message_count = 4.0
messages = ['220956', '222064', '243359', '243360']
nosy_count = 6.0
nosy_names = ['barry', 'pitrou', 'r.david.murray', 'jesstess', 'python-dev', 'zvyn']
pr_nums = []
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue21804'
versions = ['Python 3.5']

[zvyn]

The poplib classes already use Unicode internally (for everything but capability names). So to implement the UTF8 part of RFC 6856 we only need to enable the user to switch to UTF-8 mode if supported by the server.

[zvyn]

I got the Exception policy of the POP3 class wrong (ignore my review comment on that) and needed to add 'UTF8' to the list of optional commands.

[python-dev]

New changeset 6ea762200e27 by R David Murray in branch 'default':
bpo-21804: Add RFC 6856 (UTF8) support to poplib.
https://hg.python.org/cpython/rev/6ea762200e27

[bitdancer]

Thanks, Milan.