Following up on my other doctest email, here's a slightly better technique I'm using: from test_fixture import DoctestCollector import some_module collect_doctest = DoctestCollector(some_module) Then I added something to py.test.collect.Module: def collect_collectors(self, extpy): if extpy.check(basestarts='collect_'): iter = extpy.resolve()(self.extpy) for item in iter: yield item And this is the new test_fixture.py, with just a small addition to DoctestCollector (__init__ and __call__), though extpy starts to feel pretty extraneous: class DoctestCollector(PyCollector): def __init__(self, extpy_or_module): if isinstance(extpy_or_module, types.ModuleType): self.module = extpy_or_module self.extpy = None else: self.extpy = extpy_or_module self.module = self.extpy.getpymodule() def __call__(self, extpy): # we throw it away, because this has been set up to explicitly # check another module; maybe this isn't clean if self.extpy is None: self.extpy = extpy return self def __iter__(self): finder = doctest.DocTestFinder() tests = finder.find(self.module) for t in tests: yield DoctestItem(self.extpy, t) class DoctestItem(DoctestCollector.Item): def __init__(self, extpy, doctestitem, *args): self.extpy = extpy self.doctestitem = doctestitem self.name = extpy.basename self.args = args def execute(self, driver): runner = doctest.DocTestRunner() driver.setup_path(self.extpy) target, teardown = driver.setup_method(self.extpy) try: (failed, tried), run_output = capture_stdout(runner.run, self.doctestitem) if failed: raise self.Failed(msg=run_output, tbindex=-2) finally: if teardown: teardown(target) def capture_stdout(func, *args, **kw): newstdout = StringIO() oldstdout = sys.stdout sys.stdout = newstdout try: result = func(*args, **kw) finally: sys.stdout = oldstdout return result, newstdout.getvalue() -- Ian Bicking / ianb@colorstudy.com / http://blog.ianbicking.org