types.ClassType is not longer valid reference in py3

[sgpy]

Python 3.7.1 (v3.7.1:260ec2c36a, Oct 20 2018, 03:13:28)
[Clang 6.0 (clang-600.0.57)] on darwin
Type "help", "copyright", "credits" or "license" for more information.

from mox import Mox
Traceback (most recent call last):
File "", line 1, in
File "/Users/sauravgupta/Desktop/modlettuce/assets/mox-0.5.3/mox.py", line 227, in
class Mox(object):
File "/Users/sauravgupta/Desktop/modlettuce/assets/mox-0.5.3/mox.py", line 232, in Mox
_USE_MOCK_OBJECT = [types.ClassType, types.FunctionType, types.InstanceType,
AttributeError: module 'types' has no attribute 'ClassType'

only valid types

[types.FunctionType,
types.ModuleType,
types.MethodType,
]