Making virtualenv using mkvirtualenv or virtualenv, simple command memo.

- create virtual env wrapper & deactivate

mkvirtualenv env-py2 -p python2 #(or python3)
workon env-py2
deactivate

- create virtual env & deactivate

sudo pip install virtualenv
virtualenv env
sourse env/bin/activate
source deactivate

- delete virtual env

rmvirtualenv envname

- virtualenv dependencies save and install

#On the first, save
pip freeze > requirements.txt

#On the second, install(note! after activating target env)
pip install -r requirements.txt

-show all virtualenv names

lsvirtualenv -l

- PyCharm virtualenv wrapper setting
We have to set directory path manually in preference setting page.
The path is like this in my case.

And then you can select this virtualenv on run/debug configuration.