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I'm trying to deploy a Django site on an Ubuntu machine. I need to install Psycopg2 and PIL but it seems that I'm able to install them using either apt-get or using pip. Is there a difference in installing by the two methods? I know that using pip, I'm able to install it into a virtual environment but with apt-get it installs in the global python environment.
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pip is used to download and install packages directly from PyPI. PyPI is hosted by Python Software Foundation. It is a specialized package manager that only deals with python packages. apt-get is used to download and install packages from Ubuntu repositories which are hosted by Canonical.
They do exactly the same thing. In fact, the docs for distributing Python modules were just updated to suggest using python -m pip instead of the pip executable, because it's easier to tell which version of python is going to be used to actually run pip that way.
This highlights a key difference between conda and pip. Pip installs Python packages whereas conda installs packages which may contain software written in any language. For example, before using pip, a Python interpreter must be installed via a system package manager or by downloading and running an installer.
Usually python packages install to /usr/lib/python/ (ie: /usr/lib/python2.
You probably already know the benefits of apt-get. Automatic update notifications, other apt-installed packages that need those tools know they're installed, etc.
With pip, you know you're getting the latest version at the time you install it, you can install to a non-default version of Python, and you can install to a virtualenv.
If you don't need any of the features pip gives you, and you don't routinely have to install other Python packages which aren't available over APT, use the APT versions.
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