Python's unittest testing framework, how to uniformly modify the execution result of each use case in the tearDownClass method?

Question

I am using python's unittest framework. Since each test case execution will take the same amount of time [obtain the product log to determine whether it is successful or not], I want to extract the time-consuming operation to determine the success/failure of the test and put it in tearDownClass In this method, the product logs are obtained uniformly, and the success of each use case is compared one by one, which can save a lot of test execution time,

The core requirement is: in tearDownClass or elsewhere, finally modify the execution results of each test case one by one, changing success to failure