python virtualenv cheatsheet

virtualenv cheatsheet

• virtualenv cannot install arbitrary python version, but can install exist python version.

install

python3 -m pip install virtualenvwrapper

make sure python3 is the default python for system

sudo update-alternatives --config python

setup path

# <<< virtualenv setup <<<
# path for python package
export WORKON_HOME=$HOME/.virtualenvs
# path for project code
export PROJECT_HOME=$HOME/git
# default python for virtual python environment
export VIRTUALENVWRAPPER_PYTHON=/usr/bin/python3
source /usr/local/bin/virtualenvwrapper.sh
export VIRTUALENVWRAPPER_SCRIPT=/usr/local/bin/virtualenvwrapper.sh
source /usr/local/bin/virtualenvwrapper_lazy.sh
# >>> virtualenv setup >>>

usage

• create environment

mkvirtualenv -a project_dir -i package_name -r requirements.txt --python /path/to/target/python

• list environment workon, lsvirtualenv or showvirtualenv
• activate environment workon envname
• deactivate environment deactivate
• dump environment pip freeze > requiremnts.txt
• delete environment (deactivate first) rmvirtualenv