Check out this cool library. It contains several Py4D nodes which are very easy to use and might be helpful.

• Print all inports
  The value of all inports will be printed out to the sandbox.
• MinMax Nodes
  Will return the min / max value of all inports.
• Transitions
  One of the best nodes ever used in XPresso. Use it to make animations much smoother.
  Thanks to smart-page.net. The C++ version is known as ‘Smart Tween’.
• Converters
  Just a few converters
• Extract Data
  Extract information from specific datatypes. SplineData, Gradient, …

To get the package, follow the installation guide in the zip file.

Download: [zip]