I have an external package I want to install into my python virtualenv from a tar file.
What is the best way to install the package?
I've discovered 2 ways that can do it:
1) Extract the tar file, then run 'python setup.py install' inside of the extracted directory.
2) 'pip install packagename.tar.gz' from example # 7 in http://www.pip-installer.org/en/latest/usage.html#examples
Is if there is any difference doing them in these 2 ways.
On the surface, both do the same thing: doing either
python setup.py install or
pip install <PACKAGE-NAME> will install your python package for you, with a minimum amount of fuss.
However, using pip offers some additional advantages that make it much nicer to use.
setup.py, you often have to manually search out and download dependencies, which is tedious and can become frustrating.
pip uninstall <PACKAGE-NAME>and
pip install --upgrade <PACKAGE-NAME>. In contrast, if you install a package using
setup.py, you have to manually delete and maintain a package by hand if you want to get rid of it, which could be potentially error-prone.
setup.py, you have to visit the library's website, figure out where to download it, extract the file, run
setup.py... In contrast, pip will automatically search the Python Package Index (PyPi) to see if the package exists there, and will automatically download, extract, and install the package for you. With a few exceptions, almost every single genuinely useful Python library can be found on PyPi.
virtualenv, which is a program that lets you run multiple projects that require conflicting libraries and Python versions on your computer. More info.
So basically, use pip. It only offers improvements over using
python setup.py install.
If you're using an older version of Python, can't upgrade, and don't have pip installed, you can find more information about installing pip at the following links:
pip, by itself, doesn't really require a tutorial. 90% of the time, the only command you really need is
pip install <PACKAGE-NAME>. That said, if you're interested in learning more about the details of what exactly you can do with pip, see:
It is also commonly recommended that you use pip and virtualenv together. If you're a beginner to Python, I personally think it'd be fine to start of with just using pip and install packages globally, but eventually I do think you should transition to using virtualenv as you tackle more serious projects.
If you'd like to learn more about using pip and virtualenv together, see: