for mesh in bpy.data.meshes:
    if mesh.name not in bpy.data.objects:
        continue
    o = bpy.data.objects[mesh.name]
    minx = min(mesh.vertices, key=lambda x:x.co[0]).co[0] * o.scale[0] + o.location[0]
    minz = min(mesh.vertices, key=lambda x:x.co[1]).co[1] * o.scale[1] + o.location[1]
    miny = min(mesh.vertices, key=lambda x:x.co[2]).co[2] * o.scale[2] + o.location[2]
    maxx = max(mesh.vertices, key=lambda x:x.co[0]).co[0] * o.scale[0] + o.location[0]
    maxz = max(mesh.vertices, key=lambda x:x.co[1]).co[1] * o.scale[1] + o.location[1]
    maxy= max(mesh.vertices, key=lambda x:x.co[2]).co[2] * o.scale[2] + o.location[2]
    print("{%.3f,%.3f,%.3f,%.3f,%.3f,%.3f}," % (minx, miny, minz, maxx, maxy, maxz))