anaconda update failed in osx

[ChristopherLugos]

Current conda install:

           platform : osx-64
      conda version : 4.2.13
   conda is private : False
  conda-env version : 4.2.13
conda-build version : 1.18.2
     python version : 3.5.2.final.0
   requests version : 2.12.3
   root environment : /Users/lugybaby/anaconda  (writable)
default environment : /Users/lugybaby/anaconda
   envs directories : /Users/lugybaby/anaconda/envs
      package cache : /Users/lugybaby/anaconda/pkgs
       channel URLs : https://repo.continuum.io/pkgs/free/osx-64
                      https://repo.continuum.io/pkgs/free/noarch
                      https://repo.continuum.io/pkgs/pro/osx-64
                      https://repo.continuum.io/pkgs/pro/noarch
        config file : None
       offline mode : False

$ /Users/lugybaby/anaconda/bin/conda install anaconda=4.2.0

Traceback (most recent call last):
  File "/Users/lugybaby/anaconda/lib/python3.5/site-packages/conda/exceptions.py", line 479, in conda_exception_handler
    return_value = func(*args, **kwargs)
  File "/Users/lugybaby/anaconda/lib/python3.5/site-packages/conda/cli/main.py", line 145, in _main
    exit_code = args.func(args, p)
  File "/Users/lugybaby/anaconda/lib/python3.5/site-packages/conda/cli/main_install.py", line 80, in execute
    install(args, parser, 'install')
  File "/Users/lugybaby/anaconda/lib/python3.5/site-packages/conda/cli/install.py", line 238, in install
    prefix=prefix)
  File "/Users/lugybaby/anaconda/lib/python3.5/site-packages/conda/api.py", line 24, in get_index
    index = fetch_index(channel_urls, use_cache=use_cache, unknown=unknown)
  File "/Users/lugybaby/anaconda/lib/python3.5/site-packages/conda/fetch.py", line 300, in fetch_index
    repodatas = [(u, f.result()) for u, f in zip(urls, futures)]
  File "/Users/lugybaby/anaconda/lib/python3.5/site-packages/conda/fetch.py", line 300, in <listcomp>
    repodatas = [(u, f.result()) for u, f in zip(urls, futures)]
  File "/Users/lugybaby/anaconda/lib/python3.5/concurrent/futures/_base.py", line 405, in result
    return self.__get_result()
  File "/Users/lugybaby/anaconda/lib/python3.5/concurrent/futures/_base.py", line 357, in __get_result
    raise self._exception
  File "/Users/lugybaby/anaconda/lib/python3.5/concurrent/futures/thread.py", line 55, in run
    result = self.fn(*self.args, **self.kwargs)
  File "/Users/lugybaby/anaconda/lib/python3.5/site-packages/conda/fetch.py", line 75, in func
    res = f(*args, **kwargs)
  File "/Users/lugybaby/anaconda/lib/python3.5/site-packages/conda/fetch.py", line 117, in fetch_repodata
    timeout=(6.1, 60))
  File "/Users/lugybaby/anaconda/lib/python3.5/site-packages/requests/sessions.py", line 501, in get
    return self.request('GET', url, **kwargs)
  File "/Users/lugybaby/anaconda/lib/python3.5/site-packages/requests/sessions.py", line 488, in request
    resp = self.send(prep, **send_kwargs)
  File "/Users/lugybaby/anaconda/lib/python3.5/site-packages/requests/sessions.py", line 609, in send
    r = adapter.send(request, **kwargs)
  File "/Users/lugybaby/anaconda/lib/python3.5/site-packages/requests/adapters.py", line 423, in send
    timeout=timeout
  File "/Users/lugybaby/anaconda/lib/python3.5/site-packages/requests/packages/urllib3/connectionpool.py", line 594, in urlopen
    chunked=chunked)
  File "/Users/lugybaby/anaconda/lib/python3.5/site-packages/requests/packages/urllib3/connectionpool.py", line 350, in _make_request
    self._validate_conn(conn)
  File "/Users/lugybaby/anaconda/lib/python3.5/site-packages/requests/packages/urllib3/connectionpool.py", line 835, in _validate_conn
    conn.connect()
  File "/Users/lugybaby/anaconda/lib/python3.5/site-packages/requests/packages/urllib3/connection.py", line 330, in connect
    cert = self.sock.getpeercert()
  File "/Users/lugybaby/anaconda/lib/python3.5/site-packages/requests/packages/urllib3/contrib/pyopenssl.py", line 324, in getpeercert
    'subjectAltName': get_subj_alt_name(x509)
  File "/Users/lugybaby/anaconda/lib/python3.5/site-packages/requests/packages/urllib3/contrib/pyopenssl.py", line 171, in get_subj_alt_name
    ext = cert.extensions.get_extension_for_class(
AttributeError: 'Extensions' object has no attribute 'get_extension_for_class'

[kalefranz]

Duplicate of #3898, #3918, #3929, #3934, and #3935.

[github-actions]

Hi there, thank you for your contribution to Conda!

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