Something else with gravity and ragdolls

import bge
from mathutils import Vector
co = bge.logic.getCurrentController()
scene = bge.logic.getCurrentScene()

obList = []
for o in scene.objects:
    if o.__class__ == bge.types.KX_GameObject:
        obList.append(o)

def calcGrav(obA, obB, G):
    m1 = obA.mass; m2 = obB.mass
    m = m1*m2
    loc1 = obA.worldPosition
    loc2 = obB.worldPosition
    v = loc1 - loc2
    r = v.length
    F = G * ( (m) / (r*r) )
    return -v * F

def loopGrav(obs, G):
    for obA in obs:
        fV = Vector((0,0,0))
        for obB in obs:
            if obA != obB:
                fV += calcGrav(obA, obB, G)
        obA.applyForce(fV, False)

loopGrav(obList, 1)

keyb = bge.logic.keyboard
if keyb.events[bge.events.ZKEY]>0:
    for ob in obList:
        ob.applyTorque(Vector((0,0,50)), False)

if keyb.events[bge.events.XKEY]>0:
    loopGrav(obList, -2.5)

if keyb.events[bge.events.CKEY]>0:
    loopGrav(obList, 15)