How can I remove library code calls from pytest traceback?

Question

I'm using pytest with mock in my python project.

When I get a test failure that involves a mock object (almost all of them), the traceback dives into the mock library source code and my code that's actually triggering the failure often scrolls out of view.

Is there a way to tell py.test to exclude installed libraries from the traceback or something like that? The noise level is taking away from what is otherwise a sweet testing library.

Answer 1

There is a hack: a function defining the local variable __tracebackhide__ will not be shown. Example:

def some_support_code(x, y):
    __tracebackhide__ = True
    assert x == y