Permission denied installing yapf

[MikhailArkhipov]

Environment data

VS Code version: 1.19
Python Extension version: 0.9
Python Version: 2.7.10
OS and version: Mac OS 10.13.2

Attempt to says 'yes, install Yapf' on 'Format Document' yields Access Denied (looks like install has to elevate)

$ "/usr/bin/python" -m pip install -U yapf
Collecting yapf
  Downloading yapf-0.20.0-py2.py3-none-any.whl (158kB)
    100% |████████████████████████████████| 163kB 2.9MB/s
Installing collected packages: yapf
Exception:
Traceback (most recent call last):
  File "/Library/Python/2.7/site-packages/pip-9.0.1-py2.7.egg/pip/basecommand.py", line 215, in main
    status = self.run(options, args)
  File "/Library/Python/2.7/site-packages/pip-9.0.1-py2.7.egg/pip/commands/install.py", line 342, in run
    prefix=options.prefix_path,
  File "/Library/Python/2.7/site-packages/pip-9.0.1-py2.7.egg/pip/req/req_set.py", line 784, in install
    **kwargs
  File "/Library/Python/2.7/site-packages/pip-9.0.1-py2.7.egg/pip/req/req_install.py", line 851, in install
    self.move_wheel_files(self.source_dir, root=root, prefix=prefix)
  File "/Library/Python/2.7/site-packages/pip-9.0.1-py2.7.egg/pip/req/req_install.py", line 1064, in move_wheel_files
    isolated=self.isolated,
  File "/Library/Python/2.7/site-packages/pip-9.0.1-py2.7.egg/pip/wheel.py", line 345, in move_wheel_files
    clobber(source, lib_dir, True)
  File "/Library/Python/2.7/site-packages/pip-9.0.1-py2.7.egg/pip/wheel.py", line 316, in clobber
    ensure_dir(destdir)
  File "/Library/Python/2.7/site-packages/pip-9.0.1-py2.7.egg/pip/utils/__init__.py", line 83, in ensure_dir
    os.makedirs(path)
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/os.py", line 157, in makedirs
    mkdir(name, mode)
**OSError: [Errno 13] Permission denied: '/Library/Python/2.7/site-packages/yapf-0.20.0.dist-info'
PapaMac:~ Misha$**

Install via sudo succeeds. However, it says

The directory '/Users/Misha/Library/Caches/pip' or its parent directory 
is not owned by the current user and caching wheels has been disabled. 
Check the permissions and owner of that directory. If executing pip with 
sudo, you may want sudo's -H flag.

[DonJayamanne]

Closing in favor of #386