RuntimeError: Click will abort further execution because Python 3 was configured to use ASCII as encoding for the environment.

Problem

I got the following error when updated this extension, before it works.

Workspace contains pipfile but attempt to run 'pipenv --venv' failed with Traceback (most recent call last):
  File "/usr/local/Cellar/pipenv/11.9.0_1/libexec/bin/pipenv", line 11, in <module>
    load_entry_point('pipenv==11.9.0', 'console_scripts', 'pipenv')()
  File "/usr/local/Cellar/pipenv/11.9.0_1/libexec/lib/python3.6/site-packages/pipenv/vendor/click/core.py", line 722, in __call__
    return self.main(*args, **kwargs)
  File "/usr/local/Cellar/pipenv/11.9.0_1/libexec/lib/python3.6/site-packages/pipenv/vendor/click/core.py", line 676, in main
    _verify_python3_env()
  File "/usr/local/Cellar/pipenv/11.9.0_1/libexec/lib/python3.6/site-packages/pipenv/vendor/click/_unicodefun.py", line 118, in _verify_python3_env
    'for mitigation steps.' + extra)
RuntimeError: Click will abort further execution because Python 3 was configured to use ASCII as encoding for the environment.  Consult http://click.pocoo.org/python3/for mitigation steps.

This system lists a couple of UTF-8 supporting locales that
you can pick from.  The following suitable locales where
discovered: af_ZA.UTF-8, am_ET.UTF-8, be_BY.UTF-8, bg_BG.UTF-8, ca_ES.UTF-8, cs_CZ.UTF-8, da_DK.UTF-8, de_AT.UTF-8, de_CH.UTF-8, de_DE.UTF-8, el_GR.UTF-8, en_AU.UTF-8, en_CA.UTF-8, en_GB.UTF-8, en_IE.UTF-8, en_NZ.UTF-8, en_US.UTF-8, es_ES.UTF-8, et_EE.UTF-8, eu_ES.UTF-8, fi_FI.UTF-8, fr_BE.UTF-8, fr_CA.UTF-8, fr_CH.UTF-8, fr_FR.UTF-8, he_IL.UTF-8, hr_HR.UTF-8, hu_HU.UTF-8, hy_AM.UTF-8, is_IS.UTF-8, it_CH.UTF-8, it_IT.UTF-8, ja_JP.UTF-8, kk_KZ.UTF-8, ko_KR.UTF-8, lt_LT.UTF-8, nl_BE.UTF-8, nl_NL.UTF-8, no_NO.UTF-8, pl_PL.UTF-8, pt_BR.UTF-8, pt_PT.UTF-8, ro_RO.UTF-8, ru_RU.UTF-8, sk_SK.UTF-8, sl_SI.UTF-8, sr_YU.UTF-8, sv_SE.UTF-8, tr_TR.UTF-8, uk_UA.UTF-8, zh_CN.UTF-8, zh_HK.UTF-8, zh_TW.UTF-8. Make sure pipenv is on the PATH.

And I checked the encoding of system python and pipenv python, both is utf-8.

System python

$ python
Python 3.6.5 (default, Apr 11 2018, 17:50:33)
[GCC 4.2.1 Compatible Apple LLVM 9.1.0 (clang-902.0.39.1)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import sys
>>> sys.getdefaultencoding()
'utf-8'
>>>

Pipenv python

$ pipenv shell
Spawning environment shell (/bin/zsh). Use 'exit' to leave.
$ python
Python 3.6.4 (default, Mar  9 2018, 10:20:49)
[GCC 4.2.1 Compatible Apple LLVM 9.0.0 (clang-900.0.39.2)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import sys
>>> sys.getdefaultencoding()
'utf-8'
>>>

Env

VS Code: 1.22.2
Extension: 4.0.0
macOS: 10.13.4

$ locale
LANG="zh_CN.UTF-8"
LC_COLLATE="zh_CN.UTF-8"
LC_CTYPE="zh_CN.UTF-8"
LC_MESSAGES="zh_CN.UTF-8"
LC_MONETARY="zh_CN.UTF-8"
LC_NUMERIC="zh_CN.UTF-8"
LC_TIME="zh_CN.UTF-8"
LC_ALL=

The issue names no source file or test. Start by tracing the extension's pipenv --venv invocation and reproduce it under the reported macOS locale, comparing the system and Pipenv Python environments. Done means this configuration no longer causes the extension to fail, with regression coverage or documented behavior.