Would anyone have an example of creating a custom data connector using Python in JMP 19?
Start with this demo add-in Python Data Connector Demo (JMP Marketplace) (JMP 19: What's new in data connectors )
Along with what @jthi said, you can take a look at the JMP Marketplace for several other JMP addins which utilize the Python Data Connector framework. Hopefully these provide you with enough examples to get you started.