pytest支持setup和teardown，对于使用unittest和nose框架的用户来说对这些很熟悉，但是在pytest可以使用功能更强大的fixture来实现固定装置。

模块级别

如果单个模块中有多个测试函数和测试类，您可以选择实现以下固定方法，这些方法通常会为所有函数调用一次：

def setup_module(module):"""setup any state specific to the execution of the given module."""def teardown_module(module):"""teardown any state that was previously setup with a setup_modulemethod."""

 类级别

在调用类的所有测试方法之前和之后，在类级别调用以下方法

@classmethod
def setup_class(cls):"""setup any state specific to the execution of the given class (whichusually contains tests)."""@classmethod
def teardown_class(cls):"""teardown any state that was previously setup with a call tosetup_class."""

方法级别

在每个方法调用周围都会调用以下方法

def setup_method(self, method):"""setup any state tied to the execution of the given method in aclass.  setup_method is invoked for every test method of a class."""def teardown_method(self, method):"""teardown any state that was previously setup with a setup_methodcall."""

直接在模块中定义

def setup_function(function):"""setup any state tied to the execution of the given function.Invoked for every test function in the module."""def teardown_function(function):"""teardown any state that was previously setup with a setup_functioncall."""