Fast parent creator for rig controllers

Parent_Creator

import maya.cmds as mc
'''
Creates new attribute 'Parent_To', name of attribute will be assigned 
from exact names of selected Parents
parentSet( 1 ) - means that you need to select parents first and then only the child.
Script will create the rest setup for you

parentSet( 0 ) - means that you need to select parents, then the child parent node 
(group that will be assigned by constraint and will be triggered between parents) and
lastly the child node

parentSet(self=False, mode='Parent' ) - by default and means that the child will be
under parentConstraint, in other cases there will be orientConstraint

'''
def parentSet(self=False, mode='Parent' ):
	selObjs = mc.ls(sl=1)
	if self:
		childCnt = selObjs.pop(-1)
		parentCnt = childCnt
	else:
		parentCnt = selObjs.pop(-1)
		childCnt = selObjs.pop(-1)
	parNode = mc.listRelatives( childCnt, p=1 )
	attr = ''
	for n in xrange(len(selObjs)):
		attr += selObjs[n] + '=' + str(n) + ':'
	if not mc.attributeQuery( 'Parent_To', n=parentCnt, ex=1 ):
		mc.addAttr( parentCnt, longName='Parent_To', k=1, en=attr, at='enum' )
	else:
		mc.addAttr( parentCnt+'.Parent_To', e=1, en=attr, at='enum' )
	chPos = mc.xform( childCnt, q=1, ws=1, rp=1 )
	chGrp = mc.group( em=1, n=childCnt+'_grp' )
	mc.xform( chGrp, ws=1, rp=chPos )
	mc.parent( childCnt, chGrp )
	if parNode:
		mc.parent( chGrp, parNode )
	attachToParents( selObjs, parentCnt, chPos, mode, chGrp )

# Creates in-place parent groups that has the same position as the child group, i.e. child controller
# will not pop after the parent switching 	
def attachToParents( parents, parentCnt, chPos, mode, chGrp ):
	for s in xrange( len(parents) ):
		i = 0
		while mc.objExists( parents[s] + '_grp' + str(i) ):
			i += 1
		grp = mc.group( em=1, n=parents[s]+'_grp' + str(i) )
		mc.xform( grp, ws=1, rp=chPos )
		mc.parent( grp, parents[s] )
		cond = mc.createNode('condition', n=parents[s]+'cond')
		mc.connectAttr(parentCnt+'.Parent_To', cond+'.firstTerm' )
		mc.setAttr( cond+'.secondTerm', s )
		mc.setAttr( cond+'.operation', 0 )
		mc.setAttr( cond+'.colorIfTrueR', 1 )
		mc.setAttr( cond+'.colorIfFalseR', 0 )
		if mode=='Parent':
			par = mc.parentConstraint( grp, chGrp, mo=1 )
			
		else:
			par = mc.orientConstraint( grp, chGrp, mo=1 )
		attrs = mc.listAttr( par[0],ud=1 )
		mc.connectAttr(cond+'.outColor.outColorR', par[0]+'.'+attrs[s] )

# Rename the new 'Parent_To' attribute with nice names
def renameAttrs( name ):
	cnt = mc.ls( sl=1 )
	for cAttr in mc.listAttr( cnt[0],ud=1 ):
		if 'Parent_To' in cAttr:
			mc.addAttr( '.Parent_To', e=1, enumName=':'.join(name) )

parentSet( 0 )
#renameAttrs( ['Right_Hand','Left_Hand','Root'] )