pyenvメモ

#environment

• Macos Catalina 10.15.1

#install & check folder

$ brew install pyenv
$ cd ~/.pyenv

you can also install by git

#list packages and install python3.6.7 python3.6.8

$ pyenv install -l
$ pyenv install 3.6.7 3.6.8
$ pyenv versions
* system(set by /Users/xxxx/.python-version)
  3.6.7
  3.6.8  

#create virtual environment

pyenv virtualenv python_version environment_name
$ pyenv virtualenv 3.6.7 environ_3.6.7
$ pyenv versions
  system
  3.6.7
  3.6.7/envs/environ_3.6.7
  environ_3.6.7
  ...

#delete virtual environment

$ pyenv uninstall environ_3.6.7
$ pyenv versions
  system
  3.6.7
  ...

#change global python version

pyenv global python_version[or python_virtual_environment]
$ pyenv global environ_3.6.7
(environ_3.6.7) xxxxxx:~ user$ 
$ python -V
Python 3.6.7
$ cd ~/.pyenv
$ vi version
 environ_3.6.7
#if you delete this "version" file, the global python will change to system python

#switch to environment

pyenv local python_version[or python_virtual_environment]
$ pyenv local 3.6.8
(3.6.8) xxxxxx:~ user$ 
$ python -V
Python 3.6.8