1、本机安装了python2.7 python3.5 python3.6 其中3.5 3.6 sys.getdefaultencoding()输出都是 'utf-8'
2、我在pycharm 项目里面配置flask采用的是python3.6 但是一运行就报编码错误：

FLASK_APP = run.py
FLASK_ENV = development
FLASK_DEBUG = 0
In folder /Users/kevin/Documents/cmp
/Users/kevin/Documents/cmp/venv/bin/python -m flask run
Traceback (most recent call last):
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/runpy.py", line 193, in _run_module_as_main
    "__main__", mod_spec)
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/runpy.py", line 85, in _run_code
    exec(code, run_globals)
  File "/Users/kevin/Documents/cmp/venv/lib/python3.6/site-packages/flask/__main__.py", line 15, in <module>
    main(as_module=True)
  File "/Users/kevin/Documents/cmp/venv/lib/python3.6/site-packages/flask/cli.py", line 513, in main
    cli.main(args=args, prog_name=name)
  File "/Users/kevin/Documents/cmp/venv/lib/python3.6/site-packages/flask/cli.py", line 380, in main
    return AppGroup.main(self, *args, **kwargs)
  File "/Users/kevin/Documents/cmp/venv/lib/python3.6/site-packages/click/core.py", line 676, in main
    _verify_python3_env()
  File "/Users/kevin/Documents/cmp/venv/lib/python3.6/site-packages/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

Process finished with exit code 1

从来没有碰到这样的问题，不知道该如何