## エラーの状況 Windows10 で April 2018 Updateを適用したら，Windows Subsystem for Linux上で動かしているUbuntu 16.04のpip3が動かなくなった． python2系のpipは動くのに，なぜかpython3系のpip3だけエラーになる… 以下のようなメッセージが表示されてしまう． ``` $ pip3 --help Traceback (most recent call last): File "/usr/lib/python3/dist-packages/pip/_vendor/__init__.py", line 33, in vendored __import__(vendored_name, globals(), locals(), level=0) ImportError: No module named 'pip._vendor.pkg_resources' During handling of the above exception, another exception occurred: Traceback (most recent call last): File "/usr/bin/pip3", line 9, in from pip import main File "/usr/lib/python3/dist-packages/pip/__init__.py", line 13, in from pip.exceptions import InstallationError, CommandError, PipError File "/usr/lib/python3/dist-packages/pip/exceptions.py", line 6, in from pip._vendor.six import iteritems File "/usr/lib/python3/dist-packages/pip/_vendor/__init__.py", line 75, in vendored("pkg_resources") File "/usr/lib/python3/dist-packages/pip/_vendor/__init__.py", line 36, in vendored __import__(modulename, globals(), locals(), level=0) File "", line 969, in _find_and_load File "", line 958, in _find_and_load_unlocked File "", line 664, in _load_unlocked File "", line 634, in _load_backward_compatible File "/usr/share/python-wheels/pkg_resources-0.0.0-py2.py3-none-any.whl/pkg_resources/__init__.py", line 2927, in File "/usr/share/python-wheels/pkg_resources-0.0.0-py2.py3-none-any.whl/pkg_resources/__init__.py", line 2913, in _call_aside File "/usr/share/python-wheels/pkg_resources-0.0.0-py2.py3-none-any.whl/pkg_resources/__init__.py", line 2952, in _initialize_master_working_set File "/usr/share/python-wheels/pkg_resources-0.0.0-py2.py3-none-any.whl/pkg_resources/__init__.py", line 956, in subscribe File "/usr/share/python-wheels/pkg_resources-0.0.0-py2.py3-none-any.whl/pkg_resources/__init__.py", line 2952, in File "/usr/share/python-wheels/pkg_resources-0.0.0-py2.py3-none-any.whl/pkg_resources/__init__.py", line 2515, in activate File "/usr/share/python-wheels/pkg_resources-0.0.0-py2.py3-none-any.whl/pkg_resources/__init__.py", line 2097, in declare_namespace File "/usr/share/python-wheels/pkg_resources-0.0.0-py2.py3-none-any.whl/pkg_resources/__init__.py", line 2047, in _handle_ns File "/usr/share/python-wheels/pkg_resources-0.0.0-py2.py3-none-any.whl/pkg_resources/__init__.py", line 2066, in _rebuild_mod_path AttributeError: '_NamespacePath' object has no attribute 'sort' ``` なんなんだ… ## 対処 よく分からないので，pipをUbuntuリポジトリからではなく，直接入れた． ``` $ cd [適当なディレクトリ] $ wget https://bootstrap.pypa.io/get-pip.py $ sudo python3 get-pip.py ``` これで，ひとまず動くことは確認できた．