Skipping a parametrized combination - python-2.7

Question

i'm writing a test in python2.7 and the test method receives two parameters.
#pytest.mark.parametrize("letter", [
"A", "B", "C"])
#pytest.mark.parametrize("number", [
1, 2, 3])
def my_test(letter, number):
if letter == "B" and number == 2:
pytest.skip("redundant")
I need to skip a redundant combination, let's say for example (B, 2). The only "working" solution leads to calling setup_methods which is useless. Is there a more elegant solution to skip the combination without writing additional "if" condition and without accessing setup_method ?

Answer 1

The only option I would see other than your solution is to write down all possible combinations yourself and comment out or remove all redundant ones (this may be a bit more explicit):
#pytest.mark.parametrize("letter,number", [
("A", 1),
("A", 2),
("A", 3),
("B", 1),
# ("B", 2),
("B", 3),
("C", 1),
("C", 2),
("C", 3),
])
def test_foo(letter, number):
assert something...
This way you save yourself the if, but I like your solution in that way that pytest produces a nice output where it tells you which / that a combination was skipped:
============================= test session starts ==============================
collecting ... collected 9 items
stackoverflow.py::test[1-A] PASSED [ 11%]
stackoverflow.py::test[1-B] PASSED [ 22%]
stackoverflow.py::test[1-C] PASSED [ 33%]
stackoverflow.py::test[2-A] PASSED [ 44%]
stackoverflow.py::test[2-B] SKIPPED [ 55%]
Skipped: redundant
stackoverflow.py::test[2-C] PASSED [ 66%]
stackoverflow.py::test[3-A] PASSED [ 77%]
stackoverflow.py::test[3-B] PASSED [ 88%]
stackoverflow.py::test[3-C] PASSED [100%]
========================= 8 passed, 1 skipped in 0.07s =========================
I guess in this case it's a subjective decision. Both options bear their benefits and downsides.