Python examples of custom contexts

[Andruha Prostrelov]

Can some one share examples of custom context tool realisation via python ?
There are a lot of examples on C++ in books and documentation.
But no python scripts. The python scripts i googled are more like a dummy.

Here is a dummy script:

import maya.cmds as cmds
import maya.OpenMaya as om
import maya.OpenMayaMPx as mpx
import sys

pluginCtxName = "CustomContext"

class CustomSelectContext(mpx.MPxSelectionContext):
    def __init__(self):
        mpx.MPxSelectionContext.__init__(self)
   
    def doPress(self, event):
        print ('SHLOOOOOOOOOOOOOOOOMP')
       
class CommandCreator(mpx.MPxContextCommand):
    def __init__(self):
        mpx.MPxContextCommand.__init__(self)
   
    def makeObj(self):
        return mpx.asMPxPtr(CustomSelectContext())    


def initializePlugin(mobject):
    mplugin = mpx.MFnPlugin(mobject)
    try:
        mplugin.registerContextCommand( pluginCtxName, CommandCreator )  
    except:
        print "Failed to register context command: %s" % pluginCtxName
        raise


def uninitializePlugin(mobject):
    mplugin = mpx.MFnPlugin(mobject)
    try:
        mplugin.deregisterContextCommand(pluginCtxName)
    except:
        print "Failed to deregister context command: %s" % pluginCtxName
        raise

I am looking for something more complex.