Modifiing interpolation feature from its part object

Use of the platform
#1

Hi,

I would like to modify interpolation maxt() value when the function returns only part reference for interpolation. Somehow like this:

from salome.shaper import model

def make_interpolation():
    model.begin()
    partSet = model.moduleDocument()
    part = model.addPart(partSet)
    part_document = part.document()
    model.addInterpolation(part_document, "t","t*t","0", 0, 10, 100)
    return part


part = make_interpolation()
part.document().allFeatures()[0].maxt().setValue(20)

But the last line is not working, can anyone with better programing skills give an advice how I shoud do this?