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spyder 3.2.8 crashes on launch with (clean conda install of) Python 3.6.5 on MacOS 10.12.6

See original GitHub issue

Problem Description

spyder, on MacOS 10.12.6 with Python 3.6.5, crashes on attempt to launch from Anaconda or from commandline in conda env with error message including: ImportError: dlopen(/Users/stuartswerdloff/anaconda2/envs/py36/lib/python3.6/lib-dynload/_posixsubprocess.cpython-36m-darwin.so, 2): Symbol not found: __Py_set_inheritable_async_safe

however: nm -g _posixsubprocess.cpython-36m-darwin.so includes: U __Py_set_inheritable_async_safe

exact same procedure with python 3.5.5 works fine (which is what I did after the python 3.6.5 install didn’t work out so well)

What steps will reproduce the problem?

install Python 3.6.5 using conda (naming environment py36)
activate in anaconda (conda activate …)
use anaconda to install spyder
launch spyder

What is the expected output? What do you see instead?

expect: spyder UI see: traceback message, see below

Paste Traceback/Error Below (if applicable)


PASTE TRACEBACK HERE
Traceback (most recent call last):
  File "/Users/stuartswerdloff/anaconda2/envs/py36/bin/spyder", line 7, in <module>
    from spyder.app.start import main
  File "/Users/stuartswerdloff/anaconda2/envs/py36/lib/python3.6/site-packages/spyder/app/start.py", line 27, in <module>
    from spyder.config.main import CONF
  File "/Users/stuartswerdloff/anaconda2/envs/py36/lib/python3.6/site-packages/spyder/config/main.py", line 22, in <module>
    from spyder.config.user import UserConfig
  File "/Users/stuartswerdloff/anaconda2/envs/py36/lib/python3.6/site-packages/spyder/config/user.py", line 26, in <module>
    from spyder.utils.programs import check_version
  File "/Users/stuartswerdloff/anaconda2/envs/py36/lib/python3.6/site-packages/spyder/utils/programs.py", line 18, in <module>
    import subprocess
  File "/Users/stuartswerdloff/anaconda2/envs/py36/lib/python3.6/subprocess.py", line 136, in <module>
    import _posixsubprocess
ImportError: dlopen(/Users/stuartswerdloff/anaconda2/envs/py36/lib/python3.6/lib-dynload/_posixsubprocess.cpython-36m-darwin.so, 2): Symbol not found: __Py_set_inheritable_async_safe
  Referenced from: /Users/stuartswerdloff/anaconda2/envs/py36/lib/python3.6/lib-dynload/_posixsubprocess.cpython-36m-darwin.so
  Expected in: flat namespace
 in /Users/stuartswerdloff/anaconda2/envs/py36/lib/python3.6/lib-dynload/_posixsubprocess.cpython-36m-darwin.so