class Test:
    test_dict = {'test': 0}


class Test_main:
    def __init__(self):
        self.test_ = Test()


new1 = Test_main()
new2 = Test_main()

new1.test_.test_dict['test'] = 228

print(str(new1.test_.test_dict))  # {'test': 228}
print(str(new2.test_.test_dict))  # {'test': 228}