Fix misspelled attribute name in namedtuple()

[rhettinger]

BPO	36321
Nosy	@rhettinger
PRs	bpo-36321: Fix misspelled attribute in namedtuple() #12375 [3.7] bpo-36321: Fix misspelled attribute in namedtuple() (GH-12375) #12395 bpo-36321: Fix misspelled attribute name in namedtuple() #16858

^{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/rhettinger'
closed_at = <Date 2019-03-18.07:49:38.434>
created_at = <Date 2019-03-16.20:21:03.801>
labels = ['3.7', '3.8', 'type-bug', 'library']
title = 'Fix misspelled attribute name in namedtuple()'
updated_at = <Date 2019-10-20.17:19:50.673>
user = 'https://github.com/rhettinger'

bugs.python.org fields:

activity = <Date 2019-10-20.17:19:50.673>
actor = 'rhettinger'
assignee = 'rhettinger'
closed = True
closed_date = <Date 2019-03-18.07:49:38.434>
closer = 'rhettinger'
components = ['Library (Lib)']
creation = <Date 2019-03-16.20:21:03.801>
creator = 'rhettinger'
dependencies = []
files = []
hgrepos = []
issue_num = 36321
keywords = ['patch']
message_count = 4.0
messages = ['338096', '338167', '338169', '355009']
nosy_count = 1.0
nosy_names = ['rhettinger']
pr_nums = ['12375', '12395', '16858']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue36321'
versions = ['Python 3.7', 'Python 3.8']

[rhettinger]

The attribute name, '_fields_defaults' was misspelled and should have been ''_field_defaults'. The namedtuple documentation uses both spellings. The typing.NamedTuple class consistently uses the latter spelling. The intent was the both would be spelled the same way.

    >>> from typing import NamedTuple
    >>> class Employee(NamedTuple):
        name: str
        id: int = 3
    >>> Employee._field_defaults
    {'id': 3}

    >>> from collections import namedtuple
    >>> Employee = namedtuple('Employee', ['name', 'id'], defaults=[3])
    >>> Employee._fields_defaults
    {'id': 3}

Since 3.7 API is already released, it may be reasonable to provide both spellings for namedtuple().

[rhettinger]

New changeset 23581c0 by Raymond Hettinger in branch 'master':
bpo-36321: Fix misspelled attribute in namedtuple() (GH-12375)
23581c0

[rhettinger]

New changeset bedfbc7 by Raymond Hettinger (Miss Islington (bot)) in branch '3.7':
bpo-36321: Fix misspelled attribute in namedtuple() (GH-12375) (GH-12395)
bedfbc7

[rhettinger]

New changeset 58ccd20 by Raymond Hettinger in branch 'master':
bpo-36321: Fix misspelled attribute name in namedtuple() (GH-16858)
58ccd20