Change formatter warning to DeprecationWarning in 3.5

[brettcannon]

BPO	19165
Nosy	@brettcannon, @ezio-melotti, @bitdancer, @berkerpeksag
Dependencies	bpo-18716: Deprecate the formatter module

^{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 = 'https://github.com/brettcannon'
closed_at = <Date 2014-03-21.14:52:33.457>
created_at = <Date 2013-10-04.15:40:15.322>
labels = ['type-feature', 'library']
title = 'Change formatter warning to DeprecationWarning in 3.5'
updated_at = <Date 2014-03-21.14:52:33.457>
user = 'https://github.com/brettcannon'

bugs.python.org fields:

activity = <Date 2014-03-21.14:52:33.457>
actor = 'brett.cannon'
assignee = 'brett.cannon'
closed = True
closed_date = <Date 2014-03-21.14:52:33.457>
closer = 'brett.cannon'
components = ['Library (Lib)']
creation = <Date 2013-10-04.15:40:15.322>
creator = 'brett.cannon'
dependencies = ['18716']
files = []
hgrepos = []
issue_num = 19165
keywords = []
message_count = 4.0
messages = ['199214', '199280', '199310', '214373']
nosy_count = 6.0
nosy_names = ['brett.cannon', 'ezio.melotti', 'r.david.murray', 'python-dev', 'berker.peksag', 'Esa.Peuha']
pr_nums = []
priority = 'normal'
resolution = 'fixed'
stage = 'needs patch'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue19165'
versions = ['Python 3.5']

[bitdancer]

You two may know what this is about, but I have no clue :) A few more details would help if someone wants to try their hand at a patch.

[EsaPeuha]

The wanted patch seems to be very simple: change PendingDeprecationWarning to DeprecationWarning on line 24 of Lib/formatter.py but only for Python 3.5 (i.e. no need to do anything until 3.4 is released).

On a related note, should formatter be added to PEP-4?

[brettcannon]

Esa is right; this is a placeholder bug to remind me to do this in Python 3.5.

And Esa is also right about adding formatter to PEP-4; I'll reopen the original bug to remind me to do that.

[python-dev]

New changeset 455e5385752a by Brett Cannon in branch 'default':
Issue bpo-19165: The formatter module graduates to full deprecation.
http://hg.python.org/cpython/rev/455e5385752a