How to Install Packages in a Virtual Environment - Python
Once your virtual environment has been activated, any package that you install will now be installed in the
virtualenv & not globally. Hence, new packages can be without needing root privileges.
To verify that the packages are being installed into the
virtualenv run the following command to check the path of the executable that is being used :
(<Virtualenv Name) $ which python /<Virtualenv Directory>/bin/python (Virtualenv Name) $ which pip /<Virtualenv Directory>/bin/pip
Any package then installed using pip will be installed in the
virtualenv itself in the following directory :
Alternatively, you may create a file listing the needed packages.
# Install packages from requirements.txt pip install -r requirements.txt
will install version 2.10.0 of the package
You can also get a list of the packages and their versions currently installed in the active virtual environment:
# Get a list of installed packages pip freeze # Output list of packages and versions into a requirement.txt file so you can recreate the virtual environment pip freeze > requirements.txt
Alternatively, you do not have to activate your virtual environment each time you have to install a package. You can directly use the pip executable in the virtual environment directory to install packages.
$ /<Virtualenv Directory>/bin/pip install requests
Since you're installing without root in a virtual environment, this is not a global install, across the entire system - the installed package will only be available in the current virtual environment.