Thanks for the clarification.
The python calculator do not have that but rely on the python/numpy knowledge of the user.
The problem is that we have a bunch of VTK-level functions available to the calculator that are not listed anywhere (I think). For example, who knows that we have functions like max_per_block()? I always have to look it up in the algorithms.py module… I totally get that it is out of scope for this work but I wanted to put it in writing so that we are aware that this is an issue.