def pytest_addoption(parser):
    parser.addoption("--backend", action="append",
                     help=backends.keys() % "Selection the backend: one of %s")
    parser.addoption("--lazy", action="store_true", help="Only run lazy mode")
    parser.addoption("--greedy", action="store_true", help="Only run greedy mode")
dataset/ETHPy150Open OP2/PyOP2/test/conftest.py/pytest_addoption/swapped operands of `%`