pip and Python virtual environments in Ubuntu

/pip and Python virtual environments in Ubuntu
pip and Python virtual environments in Ubuntu2019-03-18T17:43:54+00:00

pip and Python virtual environments in Ubuntu

You can install python packages with pip and make virtual environments to install different versions of them in different directories. python2 is default on Ubuntu 16.04, python3 is default on 18.04. We recommend you specify the version of python or pip (python3 program.py instead of python program.py). Open Terminal on or SSH to an Ubuntu host to start.

  • Make a directory for your program if you haven’t already and change to it:
    mkdir $program_dir
    cd $program_dir
  • Make a virtual environment:
    virtualenv -p python2 venv
    or
    virtualenv -p python3 venv
  • Enter virtual environment:
    source venv/bin/activate

 

  • Search pip for package:
    pip search $package
  • Install package with pip:
    pip install $package[==$ver]
  • Example installs:
    pip install beautifulsoup4
    or
    pip install beautifulsoup4==4.6.3
  • List installed packages and their version:
    pip list
  • Show info about installed package:
    pip show $package
  • Uninstall package with pip:
    pip uninstall $package
  • If the program has requirements.txt, you can install them in one command:
    pip install -r requirements.txt

 

  • Now you can run your program in the virtual environment:
    ./$program.py
  • Exit virtual environment:
    deactivate

 

  • For more info:
    man pip
    man virtualenv