$ python3.6 -m nltk.downloader all
/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/runpy.py:125: RuntimeWarning: 'nltk.downloader' found in sys.modules after import of package 'nltk', but prior to execution of 'nltk.downloader'; this may result in unpredictable behaviour
warn(RuntimeWarning(msg))
[nltk_data] Error loading all: <urlopen error [SSL:
[nltk_data] CERTIFICATE_VERIFY_FAILED] certificate verify failed
[nltk_data] (_ssl.c:749)>
Error installing package. Retry? [n/y/e]
y
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 "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/nltk/downloader.py", line 2267, in <module>
halt_on_error=options.halt_on_error)
File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/nltk/downloader.py", line 677, in download
AttributeError: 'NoneType' object has no attribute 'id'
python 3.5.2 works well.
Tnx.