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pipenvのDistributionNotFoundを解決する

事象

久しぶりにpipenvを使用したら以下のようなエラーが発生しました。

Traceback (most recent call last):
  File "/usr/local/Cellar/pipenv/2018.11.26_2/libexec/bin/pipenv", line 6, in <module>
    from pkg_resources import load_entry_point
  File "/usr/local/Cellar/python/3.7.3/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/pkg_resources/__init__.py", line 3191, in <module>
    @_call_aside
  File "/usr/local/Cellar/python/3.7.3/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/pkg_resources/__init__.py", line 3175, in _call_aside
    f(*args, **kwargs)
  File "/usr/local/Cellar/python/3.7.3/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/pkg_resources/__init__.py", line 3204, in _initialize_master_working_set
    working_set = WorkingSet._build_master()
  File "/usr/local/Cellar/python/3.7.3/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/pkg_resources/__init__.py", line 583, in _build_master
    ws.require(__requires__)
  File "/usr/local/Cellar/python/3.7.3/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/pkg_resources/__init__.py", line 900, in require
    needed = self.resolve(parse_requirements(requirements))
  File "/usr/local/Cellar/python/3.7.3/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/pkg_resources/__init__.py", line 786, in resolve
    raise DistributionNotFound(req, requirers)
pkg_resources.DistributionNotFound: The 'pipenv==2018.11.26' distribution was not found and is required by the application

解決策

このpipenvがbrewでインストールしたものであり、再インストールすることで解決しました。

brew uninstall pipenv
brew install pipenv

参考

python - pkg_resources.DistributionNotFound: The ‘pipenv==2018.10.13’ distribution was not found and is required by the application - Stack Overflow