################  get the constraint type

# import bge
import bge

# get current scene
scene = bge.logic.getCurrentScene()

# get object list
objList = scene.objects

# get object named Cube_Green
obj1 = objList["Cube_Green"]

# get object named Cube_Red
obj2 = objList["Cube_Red"]

# want to use a line hinge constraint
constraintType = 2

# get obj1 physics ID
obj1_ID = obj1.getPhysicsId()

# get obj2 physics ID
obj2_ID = obj2.getPhysicsId()

# center of hinge position (obj1 bottom right)
edgePos_x = 1.0
edgePos_y = 0.0
edgePos_z = -1.0

# direction hinge points (obj1 y axis)
edgeAngle_x = 0.0
edgeAngle_y = 1.0
edgeAngle_z = 0.0

# create a door hinge (edge) constraint
door_hinge = bge.constraints.createConstraint( obj1_ID, obj2_ID, constraintType,
                                                                     edgePos_x, edgePos_y edgePos_z,
                                                                     edgeAngle_x, edgeAngle_y, edgeAngle_z )

# get the constraint type
type = door_hinge.constraint_type