判断是否是类，或者子类

 if isinstance(test, type) and issubclass(test,(case.TestCase, TestSuite)):
    raise TypeError("TestCases and TestSuites must be instantiated "
                            "before passing them to addTest()")

• isinstance(test, type) 判断是否是类
• issubclass(test,(case.TestCase, TestSuite))判断test是不是case.TestCase, TestSuite里的子类

标签：case,TestSuite,判断,子类,是否是,TestCase,issubclass,test
来源： https://www.cnblogs.com/kxtomato/p/16504116.html