Look for any node connections for selected objects in Maya

ConnectionsInspector

'''
Select any object and run the script, it will select any node, specified in the list of the "getDG" nType array
Some api node type examples:
Camera = camera
Parent Constraint = parentConstraint
Point Constraint = pointConstraint
Orient Constraint = orientConstraint
Aim Constraint = aimConstraint
Scale Constraint = scaleConstraint
Skin Cluster = skinCluster
Time to unitless anim curve = animCurveTU
Time to angular anim curve = animCurveTA

You can set second argument of the "getDG" to False if you want get any node connected to the transform node
or set it to True if you want get any node connection from the shape node (skinCluster node, for example)

Also you can leave third "getDG" argument Upstream as True to look for any forward connections or change it to False in order to look for backward connections

The last argument is an array that may contain objects that need to checked for connections instead of active selection 
for intaance:
constraintNodes = getDG( [ "animCurveTU", "animCurveTA"  ], False, False, True, ['pSphere1', 'pSphere2'] )
'''

import maya.api.OpenMaya as om2
import maya.api.OpenMayaAnim as oma2
def getDG( nType, getShape = False, upstream = True, pluglevel = True, sel=[] ):
	kPlugLevel = pluglevel
	direction = om2.MItDependencyGraph.kUpstream if upstream else om2.MItDependencyGraph.kDownstream
	nodes = []
	if len( sel ) == 0:
		selection = om2.MGlobal.getActiveSelectionList()
	else:
		selection = om2.MSelectionList()
		for s in sel:
			selection.add( s )
	for s in xrange( selection.length() ):
		if getShape:
			mObject = selection.getDagPath( s ).extendToShape().node()
		else:
			mObject = selection.getDependNode( s )
		mItDependencyGraph = om2.MItDependencyGraph( mObject, direction, kPlugLevel, 1 )
		while not mItDependencyGraph.isDone():
			currentItem = mItDependencyGraph.currentNode()
			dependNodeFunc = om2.MFnDependencyNode(currentItem)
			if any( [ True for x in nType if x == dependNodeFunc.typeName ] ):
				name = dependNodeFunc.name()
				nodes.append( name )
			mItDependencyGraph.next()
	return nodes
	
constraintNodes = getDG( [ 'parentConstraint'  ], False, False, True )
if constraintNodes:
	mc.select( constraintNodes, r=1 )