我们一般在做自动化测试时，用例设计之间应该是可以相互独立执行的，没有一定的前后依赖关系的，如果我们真的有前后依赖，想指定用例的先后顺序，可以用到pytest-ordering插件解决这个问题

1、安装依赖包
pip install pytest-ordering

2、运用
用例方法上添加装饰器@pytest.mark.run(order=2)，用例执行顺序会以order值大小升序去调用执行

3、先按Pytest默认执行顺序（根据用例的先后顺序）先执行了用例1（test_login_01）再执行了用例2（test_login_02）

#!/usr/bin/env python
# _*_coding:utf-8_*_
import pytestclass Test(object):def test_login_01(self):"""用例1"""print('执行用例test_login_01断言1')pytest.assume(1 == 1)print('执行用例test_login_01断言2')pytest.assume(2 == 2)def test_login_02(self):"""用例2"""print('执行用例test_login_02断言1')pytest.assume(3 == 3)print('执行用例test_login_02断言2')pytest.assume(True)if __name__ == '__main__':pytest.main(['-s', 'test_C_01.py'])C:\Users\admin\AppData\Local\Programs\Python\Python37\python.exe C:/Users/admin/Desktop/AutoTest/Test/test/test_C_01.py
============================= test session starts =============================
platform win32 -- Python 3.7.4, pytest-5.4.2, py-1.8.1, pluggy-0.13.1
rootdir: C:\Users\admin\Desktop\AutoTest\Test\test
plugins: assume-2.2.1, ordering-0.6
收集的测试用例:[<Function test_login_01>, <Function test_login_02>]
collected 2 itemstest_C_01.py 执行用例test_login_01断言1
执行用例test_login_01断言2
.执行用例test_login_02断言1
执行用例test_login_02断言2
.============================== 2 passed in 0.04s ==============================Process finished with exit code 0

4、设置了用例先后顺序为est_login_01（@pytest.mark.run(order=2)）、test_login_02（@pytest.mark.run(order=1)），调用后先执行了用例2（test_login_02）再执行了用例1（test_login_01）

#!/usr/bin/env python
# _*_coding:utf-8_*_
import pytestclass Test(object):@pytest.mark.run(order=2)def test_login_01(self):"""用例1"""print('执行用例test_login_01断言1')pytest.assume(1 == 1)print('执行用例test_login_01断言2')pytest.assume(2 == 2)@pytest.mark.run(order=1)def test_login_02(self):"""用例2"""print('执行用例test_login_02断言1')pytest.assume(3 == 3)print('执行用例test_login_02断言2')pytest.assume(True)if __name__ == '__main__':pytest.main(['-s', 'test_C_01.py'])C:\Users\admin\AppData\Local\Programs\Python\Python37\python.exe C:/Users/admin/Desktop/AutoTest/Test/test/test_C_01.py
============================= test session starts =============================
platform win32 -- Python 3.7.4, pytest-5.4.2, py-1.8.1, pluggy-0.13.1
rootdir: C:\Users\admin\Desktop\AutoTest\Test\test
plugins: assume-2.2.1, ordering-0.6
收集的测试用例:[<Function test_login_01>, <Function test_login_02>]
collected 2 itemstest_C_01.py 执行用例test_login_02断言1
执行用例test_login_02断言2
.执行用例test_login_01断言1
执行用例test_login_01断言2
.============================== 2 passed in 0.06s ==============================Process finished with exit code 0