Eclipse with PyDev vs Spyder

Eclipse has a large and active community, which has resulted in a wide variety of plugins.

Django Integration, Auto code completion, Multi language support, Integrated Python Debugging, code analysis, code templates ,smart indent, bracket matching, error markup, source control integration, code folding, UML Editing and viewing, and unit test integration.

If your project includes non-Python pieces (ie. Javascript, CSS, UML, etc) Eclipse tends to provide much better support for these than IDEs focused exclusively on Python.

It's very handy for managing multiple projects that each use their own virtualenv or conda environment, you can assign a different interpreter to each project and they will handle things like code completion correctly.

Because Eclipse is based on SWT, it uses the native font rendering and thus looks better than other IDEs on some Linux systems, where the Java font rendering is not optimal.

It handles both Jython and CPython.

Released under the MIT license.

Spyder can plot graphs and provide the list of all variables.

Pylint integration enables to check the code for PEP8 style guide and detect errors.

Spyder's autocomplete features are made possible by a library called rope which gives Spyder powerful autocompletion.

Spyder (formerly Pydee) has support for all of the major operating platforms - Linux, Mac, and even Windows.

Aside from being an open sourced, actively developed IDE, vim key-binding support is also available. If you remember Pydee - this is it, albeit with a new name.

Dynamic variable explorer with editor and visualizer