インスールエラー jupyter labextension install @jupyter-widgets/jupyterlab-manager

Question

ipywidgetsをhttps://ipywidgets.readthedocs.io/en/stable/user_install.html
に従いインストール。以下をインスール中にエラーが発生。

jupyter labextension install @jupyter-widgets/jupyterlab-manager

PythonとJupyter関連のバージョン

Python 3.7.7
jupyter core     : 4.6.3
jupyter-notebook : 6.1.1
qtconsole        : 4.7.5
ipython          : 7.18.1
ipykernel        : 5.3.4
jupyter client   : 6.1.6
jupyter lab      : not installed
nbconvert        : 5.6.1
ipywidgets       : 7.5.1
nbformat         : 5.0.7
traitlets        : 4.3.3

jupyter labextension install @jupyter-widgets/jupyterlab-manager
を実行した後のエラー

ERROR:root:code for hash md5 was not found.
Traceback (most recent call last):
  File "/usr/local/Cellar/python@2/2.7.16/Frameworks/Python.framework/Versions/2.7/lib/python2.7/hashlib.py", line 147, in <module>
    globals()[__func_name] = __get_hash(__func_name)
  File "/usr/local/Cellar/python@2/2.7.16/Frameworks/Python.framework/Versions/2.7/lib/python2.7/hashlib.py", line 97, in __get_builtin_constructor
    raise ValueError('unsupported hash type ' + name)
ValueError: unsupported hash type md5
ERROR:root:code for hash sha1 was not found.
Traceback (most recent call last):
  File "/usr/local/Cellar/python@2/2.7.16/Frameworks/Python.framework/Versions/2.7/lib/python2.7/hashlib.py", line 147, in <module>
    globals()[__func_name] = __get_hash(__func_name)
  File "/usr/local/Cellar/python@2/2.7.16/Frameworks/Python.framework/Versions/2.7/lib/python2.7/hashlib.py", line 97, in __get_builtin_constructor
    raise ValueError('unsupported hash type ' + name)
ValueError: unsupported hash type sha1
ERROR:root:code for hash sha224 was not found.
Traceback (most recent call last):
  File "/usr/local/Cellar/python@2/2.7.16/Frameworks/Python.framework/Versions/2.7/lib/python2.7/hashlib.py", line 147, in <module>
    globals()[__func_name] = __get_hash(__func_name)
  File "/usr/local/Cellar/python@2/2.7.16/Frameworks/Python.framework/Versions/2.7/lib/python2.7/hashlib.py", line 97, in __get_builtin_constructor
    raise ValueError('unsupported hash type ' + name)
ValueError: unsupported hash type sha224
ERROR:root:code for hash sha256 was not found.
Traceback (most recent call last):
  File "/usr/local/Cellar/python@2/2.7.16/Frameworks/Python.framework/Versions/2.7/lib/python2.7/hashlib.py", line 147, in <module>
    globals()[__func_name] = __get_hash(__func_name)
  File "/usr/local/Cellar/python@2/2.7.16/Frameworks/Python.framework/Versions/2.7/lib/python2.7/hashlib.py", line 97, in __get_builtin_constructor
    raise ValueError('unsupported hash type ' + name)
ValueError: unsupported hash type sha256
ERROR:root:code for hash sha384 was not found.
Traceback (most recent call last):
  File "/usr/local/Cellar/python@2/2.7.16/Frameworks/Python.framework/Versions/2.7/lib/python2.7/hashlib.py", line 147, in <module>
    globals()[__func_name] = __get_hash(__func_name)
  File "/usr/local/Cellar/python@2/2.7.16/Frameworks/Python.framework/Versions/2.7/lib/python2.7/hashlib.py", line 97, in __get_builtin_constructor
    raise ValueError('unsupported hash type ' + name)
ValueError: unsupported hash type sha384
ERROR:root:code for hash sha512 was not found.
Traceback (most recent call last):
  File "/usr/local/Cellar/python@2/2.7.16/Frameworks/Python.framework/Versions/2.7/lib/python2.7/hashlib.py", line 147, in <module>
    globals()[__func_name] = __get_hash(__func_name)
  File "/usr/local/Cellar/python@2/2.7.16/Frameworks/Python.framework/Versions/2.7/lib/python2.7/hashlib.py", line 97, in __get_builtin_constructor
    raise ValueError('unsupported hash type ' + name)
ValueError: unsupported hash type sha512
Traceback (most recent call last):
  File "/usr/local/bin/jupyter-labextension", line 6, in <module>
    from jupyterlab.labextensions import main
  File "/usr/local/lib/python2.7/site-packages/jupyterlab/labextensions.py", line 18, in <module>
    from .commands import (
  File "/usr/local/lib/python2.7/site-packages/jupyterlab/commands.py", line 26, in <module>
    from jupyterlab_launcher.process import which, Process, WatchHelper
  File "/usr/local/lib/python2.7/site-packages/jupyterlab_launcher/__init__.py", line 5, in <module>
    from .handlers import add_handlers, LabHandler, LabConfig
  File "/usr/local/lib/python2.7/site-packages/jupyterlab_launcher/handlers.py", line 10, in <module>
    from notebook.base.handlers import IPythonHandler, FileFindHandler
  File "/usr/local/lib/python2.7/site-packages/notebook/base/handlers.py", line 29, in <module>
    from jinja2 import TemplateNotFound
  File "/usr/local/lib/python2.7/site-packages/jinja2/__init__.py", line 9, in <module>
    from .bccache import BytecodeCache
  File "/usr/local/lib/python2.7/site-packages/jinja2/bccache.py", line 15, in <module>
    from hashlib import sha1
ImportError: cannot import name sha1

正常にインストール完了するために、どうエラーに対処すれば良いか不明のため、教えてください。

Answer 1

conda環境で、the kernel installed in an environment called py36, the commands are:
の仮想環境指定を間違っていたため、エラーがでたらしい。

conda install -n py36 -c conda-forge ipywidgets