python on android

Python on Android

http://kivy.org/#home
"Open source library for rapid development of applications that make use of innovative user interfaces, such as multi-touch apps."
"Kivy is running on Linux, Windows, MacOSX and Android. You can run the same [python] code on all supported platforms."
Kivy Showcase app
https://market.android.com/details?id=org.kivy.showcase&hl=en

There is also the new ASE project, it looks awesome, and has some integration with native Android components. Android Scripting Environment

“Debug certificate expired” error in Eclipse Android plugins

Here is the solution for your problem

Delete your debug certificate under ~/.android/debug.keystore on Linux and Mac OS X; the directory is something like %USERPROFILE%/.androidon Windows.
The Eclipse plugin should then generate a new certificate when you next try to build a debug package. You may need to clean and then build to generate the certificate.