Add support to load from paths to json.load

[DaniFojo]

BPO	36378
Nosy	@rhettinger, @ezio-melotti, @methane, @tirkarthi, @DaniFojo
PRs	bpo-36378: Added support to strings and Path objects to json.load #12465

^{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 2019-04-11.13:45:33.990>
created_at = <Date 2019-03-20.08:44:18.368>
labels = ['3.8', 'type-feature', 'library']
title = 'Add support to load from paths to json.load'
updated_at = <Date 2019-04-11.13:45:33.981>
user = 'https://github.com/DaniFojo'

bugs.python.org fields:

activity = <Date 2019-04-11.13:45:33.981>
actor = 'methane'
assignee = 'none'
closed = True
closed_date = <Date 2019-04-11.13:45:33.990>
closer = 'methane'
components = ['Library (Lib)']
creation = <Date 2019-03-20.08:44:18.368>
creator = 'DaniFojo'
dependencies = []
files = []
hgrepos = []
issue_num = 36378
keywords = ['patch']
message_count = 3.0
messages = ['338442', '338448', '339974']
nosy_count = 5.0
nosy_names = ['rhettinger', 'ezio.melotti', 'methane', 'xtreak', 'DaniFojo']
pr_nums = ['12465']
priority = 'normal'
resolution = 'rejected'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue36378'
versions = ['Python 3.8']

[DaniFojo]

Add support to json.load to read from a string or Path object containing the path to a json file. Many libraries (like Numpy) support this behavior.

[tirkarthi]

This expands the API where json.load now only accepts open file objects to support str and pathlike objects. This was discussed in https://mail.python.org/pipermail/python-ideas/2017-March/045303.html where there were alternatives proposed as below :

with path.open() as f: obj = json.load(f)

some_path.write_text(json.dumps(obj), encoding='utf8')
json.loads(some_path.read_text(encoding='utf8'))

Also supporting str and pathlib passes responsibility to json.load to open them and also close them properly? I think this needs a python-ideas discussion if the proposal has something to add other than the previous thread where many alternatives were mentioned for terse code.

[methane]

I close this because PR is closed already, and same idea
was discussed on -ideas ML.