ディストリビューションバージョンアップで動作しなくなったvenvの再構築

現象

(venv) $ python3.5 -v
import _frozen_importlib # frozen
import _imp # builtin
import sys # builtin
import '_warnings' # <class '_frozen_importlib.BuiltinImporter'>
import '_thread' # <class '_frozen_importlib.BuiltinImporter'>
import '_weakref' # <class '_frozen_importlib.BuiltinImporter'>
import '_frozen_importlib_external' # <class '_frozen_importlib.FrozenImporter'>
import '_io' # <class '_frozen_importlib.BuiltinImporter'>
import 'marshal' # <class '_frozen_importlib.BuiltinImporter'>
import 'posix' # <class '_frozen_importlib.BuiltinImporter'>
import _thread # previously loaded ('_thread')
import '_thread' # <class '_frozen_importlib.BuiltinImporter'>
import _weakref # previously loaded ('_weakref')
import '_weakref' # <class '_frozen_importlib.BuiltinImporter'>
(略)
import 'site' # <_frozen_importlib_external.SourceFileLoader object at 0x767f7790>
Python 3.5.8 (default, Dec 14 2019, 09:32:39)
[GCC 6.3.0 20170516] on linux
Type "help", "copyright", "credits" or "license" for more information.
import 'atexit' # <class '_frozen_importlib.BuiltinImporter'>

調査

$ ls bin/python3.5 -l
lrwxrwxrwx 1 syoshida syoshida 18 Jan 19  2019 bin/python3.5 -> /usr/bin/python3.5
$ ls  /usr/bin/python3.5
$ which python3.5
/usr/local/bin/python3.5

deadシンボリックリンクを消して修復(消さないと　Error: [Errno 2] No such file or directory: 'env3.5/bin/python3.5')

$ cd bin
$ rm python*
$ python3.5 -m venv env3.5
$ . env3.5/bin/activate
$ python -V
Python 3.5.8

参考
Fixing virtualenv after Upgrading Your Distribution/Python
https://www.guyrutenberg.com/2012/05/30/fixing-virtualenv-after-upgrading-your-distributionpython/

(depending on how you created it in the same place). All the modules you’ve already installed should keep working as before (at least it was that way for me).

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