unable to turn off ellipses in stack traces

[smurfix]

Even when using py.test -vvvv, variables in stack traces are ellipsized when their representation gets "too long".

This is controlled by hard coded constants in py._io.saferepr.py::saferepr() (and more constants in Python's reprlib, which it inherits from), which is called from multiple locations in py._code/code.py.

Proposed solution: use pretty printing instead, at high verbosity levels.

[smurfix]

https://stackoverflow.com/questions/38000993/how-can-i-get-my-assertions-in-pytest-to-stop-being-abbreviated-with-ellipsis

[nicoddemus]

Thanks @smurfix.

I believe pytest-dev/py#154 is a step in this direction.

Also I think we can close as duplicate of #980?

[smurfix]

Right … didn't find that due to wholly different search keywords. Let's continue there.

I'm somewhat unhappy with that pull request because when you have a complex data structure to report it's nearly indecipherable as a one-liner, so merely increasing the limits doesn't help that much.

[domantasjurkus]

Having the same issue, comparing two objects is cumbersome:

pytest tests/logic/test_branded_ratios.py -vvvv
...
expected = [{'asessions': 1, 'growth_categorisation': 'brand', 'hostname': 'www.blah.net', 'landingpage': '/', ...}, {'ases...', ...}, {'asessions': 1, 'growth_categorisation': 'unpaid', 'hostname': 'www.blah.fr', 'landingpage': '/', ...}]
actual = [{'asessions': 2, 'growth_categorisation': 'brand', 'hostname': 'www.blah.ru', 'landingpage': '/', ...}, {'asess...', ...}, {'asessions': 1, 'growth_categorisation': 'brand', 'hostname': 'www.blah.net', 'landingpage': '/', ...}]

[blueyed]

Related: #5936 / #3962