[Python] Pytest text annotation for test with tuple of parameters

I'm looking for more elegant solution for this kind of problem:

def ids(x):
if isinstance(x, int):
return str(x)
elif isinstance(x, str):
return x[0]


@pytest.mark.parametrize("number, string",
[
(1, "One"),
(2, "Two"),
(3, "Three")
],
ids=ids)
def test_stupid(number, string):
assert 0 == 1


This code will produce test names: '1-O', '2-T', '3-T'.

The problem is that pytest is using same function for all arguments in tuple and I have to deal with ugly isinstance calls.

Is there a better way to solve this problem?

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