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To do all these things RealFlow/Python offers several methods:

for ... in

This construction is required if you want to loop through individual particles, nodes, vertices. In common terms: list elements. The notation is basically always the same, and only the type of scene element changes:

Scene Nodes

Here is a loop for all nodes in a scene. There is no differentiation between domains, emitters, objects, daemons, etc.:

# Mind the leading spaces. Without them you will get syntax errors!
allSceneNodes = scene.getNodes()
for singleNode in allSceneNodes:
	do something with singleNode, e.g. change one or more parameters

Scene Objects

Here is a loop for all nodes in a scene. The same principle is valid for daemons, domains, splines, cameras (scene.getDaemons(), scene.get_DY_Domains(), scene.getSplines(), scene.getCameras()).

# Mind the leading spaces. Without them you will get syntax errors!
allSceneObjects = scene.getObjects()
for singleObject in allSceneObjects
	do something with singleObject, e.g. activate its rigid body dynamics feature

Dyverso Particles

Here is a loop for a dyverso domain's ("DY_Domain01") particles. The same principle is valid for Hybrido particles and standard particle emitters:

#Mind the leading spaces. Without them you will get syntax errors!
dyversoDomain          = scene.get_DY_Domain("DY_Domain01")
dyversoDomainParticles = dyversoDomain.getParticles()
for singleParticle in dyversoDomainParticles:
	do something with singleParticle, e.g. get its age and delete it after a certain time

for .. in range(start, stop)

This type of loop is used if you want to specify a certain range.