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Franco Masotti 3 years ago
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title: Running python scripts using different package versions
tags: [python, pacman, pip, venv, script, shell, bash, AUR]
updated: 2019-11-10 17:05
description: A couple of ways to prevent file conflicts on python packages and run scripts without package version problems
## Introduction
Installing Python packages from pacman as well as pip, using the root user,
is not a good idea because pacman cannot keep track of files
written by pip in the installation directories. File conflicts
are easy to come out.
This problem stands out especially when using Python packages
installed from AUR because of their lack of maintenance. In this case
I was tempted to run ``pip3 install ${PACKAGE}``...
Have a look at [this article](
which is released under the Creative Commons Attribution-ShareAlike 4.0 International License
by László Kiss Kollár.
## Solutions
Just as the original article explains, I suggest two methods:
1. use the user installation method if you just need the executable
2. use the virtual environment method if you need to import a module
for a script.
The only problem of these two systems is that package updates need to be
handled manually.
### User installation method
Add the following to your shell's configuration (with GNU Bash use `~/.bashrc`):
export PATH=$HOME/.local/bin:$PATH
Reload your shell and run:
pip3 install "${PACKAGE_NAME}" --user
You can now call the executable just like you would do after
installing a package using the root user (`# pip3 install "${PACKAGE_NAME}"`)
### Virtual environment method
Install virtualenv and then create a new virtual environment:
python3 -m venv .local/venv/"${ENVIRONMENT_NAME}"
. ~/.local/venv/"${ENVIRONMENT_NAME}"/bin/activate
pip3 install ${YOUR_PACKAGES}
To run a script using the newly created virtual environment
you must call the virtual interpreter directly:
~/.local/venv/"${ENVIRONMENT_NAME}"/bin/python3 "${SCRIPT_PATH}"
Finally, add the path of the virtual environment executables to
the shell's path:
export PATH=$PATH:~/.local/venv/"${ENVIRONMENT_NAME}"/bin
Reload your shell to be able to call a virtual environment executable directly.
## Conclusion
Don't mess up your Python installation and have fun :)