Hi all, I can hear the groans already that here comes Python Mocking Framework Number 15 with new and improved syntax on the other 14, but plase hear me out for a paragraph or two! I've been following the Python mocking framework discussions with interest and wondered about joining in with my own contribution, but as this one is a bit different and is trying to solve a slightly different problem I've stayed out of it so far. The problem I'm (primarily) addressing is mocking out substantial subsystems and third-party modules when doing functional tests, and being easily able to handle the situation when the mocked subsystem changes its behaviour. I've found in the past that it's easy for mocks to diverge from what the real system does, and continue to pass even when the real code will break. Where other mocking frameworks primarily focus on mocking code that you own and write yourself, CaptureMock is more about mocking out code that you don't own. Anyway, I've created a mock framework that captures interaction with any given module, attribute or function, and stores the results in a text file. Any tests using it can then either be run in record or replay mode each time they are run. An obvious setup is therefore to ordinarily use replay mode but to re-record if anything in the interaction changes. And perhaps to have a CI setup somewhere that always uses record mode and hence verifies that the integration still works. Using it doesn't really involve writing mock code like existing mock tools do. It just requires saying what you want to capture: from capturemock import capturemock @capturemock("smtplib") def test_something_sending_email():     # etc @capturemock("datetime.datetime.now") def test_some_real_time_code():     # etc @capturemock("matplotlib") def test_my_graph_stuff():     # etc For more details (including what the recorded format looks like), see http://www.texttest.org/index.php?page=capturemock and obviously install from PyPI with "pip install capturemock" or similar. Any feedback much appreciated. I've been using it for some time, it's been hardwired into my TextTest tool until now, but it should be regarded as Alpha outside that context for obvious reasons... Regards, Geoff Bache