[PYTHON] pyenv + virtualenv + Anaconda

I was able to install and use it from the article of my predecessor, but after a few months I didn't know how to restore the environment, so it's a memorandum.

Summary of how to create a Python virtual environment with pyenv

That wasn't deactivate.

** Conclusion **

$ pyenv global system

What was each in the first place?

pyenv
You can create an environment (pip install) for each version of python.
virtualenv
pyenv extension. You can create a named environment (the same python version as any other environment is acceptable).
You can think of it as a set with ** pyenv-virtualenv **.
Anaconda
Same as the above set (but conda install)

The purpose was to make these two virtual environments coexist.

Other virtual environments

venv
Python standard features
It looks like
pipenv
pip + venv.
It seems that many people divide the environment by ** docker **.

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