Crase

from __future__ import print_function
import hou

class PythonTwistState():
    def __init__(self, state_name, scene_viewer):
        self.state_name = state_name
        self.scene_viewer = scene_viewer

    def onHandleToState(self, kwargs):
        # Called when the user manipulates a handle

        handle_name = kwargs["handle"]
        parms = kwargs["parms"]
        prev_parms = kwargs["prev_parms"]

        print("User edited handle:", handle_name)
        for parm_name in kwargs["mod_parms"]:
            old_value = prev_parms[parm_name]
            new_value = parms[parm_name]
            print("%s was: %s now: %s" % (parm_name, old_value, new_value))

    def onStateToHandle(self, kwargs):
        # Called when the user changes parameter(s), so you can update
        # dynamic handles if necessary

        parms = kwargs["parms"]
        print("Parameters are now:", parms)
        for p in parms:
            print(p)


template = hou.ViewerStateTemplate(
    "pythontwist",
    "Python Twist",
    hou.sopNodeTypeCategory()
)
template.bindFactory(PythonTwistState)
template.bindHandle("xform", "twist_handle", cache_previous_parms=True)

hou.ui.registerViewerState(template)