format() function prints fillchar as backslash twice

[pradeepkr]

BPO	30321
Nosy	@zware

^{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 2017-05-09.19:49:19.549>
created_at = <Date 2017-05-09.19:45:12.429>
labels = ['invalid']
title = 'format() function prints fillchar as backslash twice'
updated_at = <Date 2017-05-09.19:49:19.548>
user = 'https://bugs.python.org/pradeepkr'

bugs.python.org fields:

activity = <Date 2017-05-09.19:49:19.548>
actor = 'zach.ware'
assignee = 'none'
closed = True
closed_date = <Date 2017-05-09.19:49:19.549>
closer = 'zach.ware'
components = []
creation = <Date 2017-05-09.19:45:12.429>
creator = 'pradeepkr'
dependencies = []
files = []
hgrepos = []
issue_num = 30321
keywords = []
message_count = 2.0
messages = ['293343', '293344']
nosy_count = 2.0
nosy_names = ['zach.ware', 'pradeepkr']
pr_nums = []
priority = 'normal'
resolution = 'not a bug'
stage = 'resolved'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue30321'
versions = ['Python 3.6']

[pradeepkr]

The output expected is,
'\R\'

but it shows this.

>>> '{:\^3}'.format('R')
'\\R\\'
>>>

[zware]

>>> result = '{:\^3}'.format('R')
>>> result
'\\R\\'
>>> print(result)
\R\
>>> print("backslash (\\) is escaped by another backslash in str's repr")
backslash (\) is escaped by another backslash in str's repr