Improve repr for _tuplegetter objects

[rhettinger]

BPO	40277
Nosy	@rhettinger, @ammaraskar
PRs	bpo-40277: Add a repr() to namedtuple's _tuplegetter to aid with introspection #19537

^{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 2020-04-15.06:37:05.093>
created_at = <Date 2020-04-14.01:23:39.288>
labels = ['interpreter-core', 'easy', 'type-feature']
title = 'Improve repr for _tuplegetter objects'
updated_at = <Date 2020-04-15.06:37:05.093>
user = 'https://github.com/rhettinger'

bugs.python.org fields:

activity = <Date 2020-04-15.06:37:05.093>
actor = 'rhettinger'
assignee = 'rhettinger'
closed = True
closed_date = <Date 2020-04-15.06:37:05.093>
closer = 'rhettinger'
components = ['Interpreter Core']
creation = <Date 2020-04-14.01:23:39.288>
creator = 'rhettinger'
dependencies = []
files = []
hgrepos = []
issue_num = 40277
keywords = ['patch', 'easy (C)']
message_count = 3.0
messages = ['366357', '366489', '366490']
nosy_count = 2.0
nosy_names = ['rhettinger', 'ammar2']
pr_nums = ['19537']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue40277'
versions = []

[rhettinger]

Formerly, the accessor for named tuples were more informative:

    >>> class Pt(NamedTuple):
            x: int
            y: int

    >>> vars(Pt)['x']
    <property object at 0x10cc09a70>
    >>> vars(Pt)['x'].fget
    operator.itemgetter(0)

Currently, it is less informative:

    >>> vars(Pt)['x']
    <_collections._tuplegetter object at 0x1066a08e0>

The repr should be updated to show how the object could been created:

    >>> vars(Pt)['x']
    _tuplegetter(0, 'Alias for field number 0')

[rhettinger]

New changeset a86b522 by Ammar Askar in branch 'master':
bpo-40277: Add a repr() to namedtuple's _tuplegetter to aid with introspection (GH-19537)
a86b522

[rhettinger]

Thanks for the PR :-)