very simple info-carrying object

info object

# custom object definition
class MyCustomObject():
    def __init__(self,obj):
        obj.addProperty("App::PropertyStringList","CustomProps","Base", "A placeholder for custom properties")
        obj.Proxy = self
    def execute(self,obj):
        pass

# create one in the current doc
myobj = FreeCAD.ActiveDocument.addObject("App::FeaturePython","MyObject")
MyCustomObject(myobj)

# set some properties
myobj.CustomProps = ["myValue","123","myOtherValue","456"]

# retrieve a value
if "myValue" in myobj.CustomProps:
    idx = myobj.CustomProps.index("myValue") + 1
    val = myobj.CustomProps[idx]