pytest（三十七）--fixture参数化params

def fixture(
    callable_or_scope=None,
    *args,
    scope="function",
    params=None,
    autouse=False,
    ids=None,
    name=None
):
    """Decorator to mark a fixture factory function.

    This decorator can be used, with or without parameters, to define a
    fixture function.

    The name of the fixture function can later be referenced to cause its
    invocation ahead of running tests: test
    modules or classes can use the ``pytest.mark.usefixtures(fixturename)``
    marker.

    Test functions can directly use fixture names as input
    arguments in which case the fixture instance returned from the fixture
    function will be injected.

    Fixtures can provide their values to test functions using ``return`` or ``yield``
    statements. When using ``yield`` the code block after the ``yield`` statement is executed
    as teardown code regardless of the test outcome, and must yield exactly once.

    :arg scope: the scope for which this fixture is shared, one of
                ``"function"`` (default), ``"class"``, ``"module"``,
                ``"package"`` or ``"session"`` (``"package"`` is considered **experimental**
                at this time).

                This parameter may also be a callable which receives ``(fixture_name, config)``
                as parameters, and must return a ``str`` with one of the values mentioned above.

                See :ref:`dynamic scope` in the docs for more information.

    :arg params: an optional list of parameters which will cause multiple
                invocations of the fixture function and all of the tests
                using it.
                The current parameter is available in ``request.param``.

    :arg autouse: if True, the fixture func is activated for all tests that
                can see it.  If False (the default) then an explicit
                reference is needed to activate the fixture.

    :arg ids: list of string ids each corresponding to the params
                so that they are part of the test id. If no ids are provided
                they will be generated automatically from the params.

    :arg name: the name of the fixture. This defaults to the name of the
                decorated function. If a fixture is used in the same module in
                which it is defined, the function name of the fixture will be
                shadowed by the function arg that requests the fixture; one way
                to resolve this is to name the decorated function
                ``fixture_<fixturename>`` and then use
                ``@pytest.fixture(name=‘<fixturename>‘)``.
    """

    :arg params: an optional list of parameters which will cause multiple
                invocations of the fixture function and all of the tests
                using it.
                The current parameter is available in ``request.param``.

#test_a.py
import pytest
data=["admin","test"]
@pytest.fixture(scope="function",params=data)
def user(request):
    return request.param
def test_register(user):
    print("注册用户:{}".format(user))

if __name__=="__main__":
    pytest.main(["-s","test_a.py"])

#test_a.py
import pytest
def delete_sql(user):
    sql="delete from users where username = {}".format(user)
    print("执行的sql,删除用户:{}".format(user))

data=["admin","test"]
@pytest.fixture(scope="function",params=data)
def user(request):
    #前置操作
    delete_sql(request.param)
    yield request.param
    #后置操作
    print("===成功:{}===".format(request.param))
def test_register(user):
    print("注册用户:{}".format(user))

if __name__=="__main__":
    pytest.main(["-s","test_a.py"])