

It is critical that Java, Python, and Eclipse are either all 32 Bit or are all 64 Bit (and only if your Machine/OS supports 64 Bit): I think it easiest on Macs to use 64 Bit for everything.

The version you should download is Eclipse IDE for Eclipse Committers.
ECLIPSE IDE FOR PYTHON FOR MAC
* Customize and extend Eclipse and make it your own using their marketplace. In this handout we will download Eclipse Standard 4.4 for Mac OS. * An impressive collection of tools can be easily installed into your Eclipse desktop IDE, including GUI builders and tools for modeling, charting and reporting, testing, and more. You can then publish plug-ins to our Eclipse Marketplace of 1000s. It is a project in its infancy so there is so much more to come. We provide multiple platforms to build plug-ins for desktop tools, distributed services used by cloud IDEs, and browser interfaces. The Eclipse Advanced Scripting Environment provides a great way to get more out of your Eclipse IDE by leveraging the power of Python. Use your imagination to build services and tools that can be assembled into new IDEs or packages tailored to your identity. The Eclipse is defined as platform for developing the computer-based applications using various programming language like JAVA, Python, C/C++, Ruby and many. * Create the next generation of developer tooling with our extensible platforms. The Eclipse IDE is famous for our Java Integrated Development Environment (IDE), but we have a number of pretty cool IDEs, including our C/C++ IDE, JavaScript/TypeScript IDE, PHP IDE, and more.

The out of the box features include code completion, code analysis, refactoring, Python debugging, and even an interactive console. After installing a simple plugin for your Eclipse IDE, PyDev can be used for Python, Jython and IronPython development. Use your browser to develop with hosted workspaces or install desktop packaging to experience a modern development environment for Java, JavaScript, CSS, and HTML. Eclipse + PyDev Eclipse isn’t a Python-specific IDE. It'll be there, in the cloud, right where you left it.
