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I'm very pleased to announce the release of Python Mode for Processing 3.x, available through your "Add Mode..." dialog.
Python Mode lets you write Processing sketches, which run in the Java-based Processing runtime, using the Python programming language. Because the runtime is the Processing runtime, and not a new implementation, you may use most existing third-party libraries. You may also use any third-party pure-Python libraries by dropping them into your sketch folder.
Much of the work in achieving compatibility with Processing 3.x was was done by Luca Damasco (Google Summer of Code student), under the supervision of Golan Levin, with additional support from the Frank-Ratchye STUDIO for Creative Inquiry at Carnegie Mellon University. Without Luca, the project may well have died.
Development takes place at https://github.com/jdf/processing.py.