unittest类型不能增加__init__()的问题

[JeanLove]

我写了一个ut小代码，如下：

import unittest
class mytest(unittest.TestCase):
    def setUp(self):
        print 'setup'
        pass
    def tearDown(self):
        print 'tearDown'
        pass
    def testTrue(self):
        self.assertTrue(True)
if __name__=="__main__":
    unittest.main()

没有问题，但是如果我增加一个__init__()函数，就会出错：

import unittest
class mytest(unittest.TestCase):
    def __init__(self):
        print '__init__'
    def setUp(self):
        print 'setup'
        pass
    def tearDown(self):
        print 'tearDown'
        pass
    def testTrue(self):
        self.assertTrue(True)
if __name__=="__main__":
    unittest.main()

运行并提示错误：

  File "C:\Python27\lib\unittest\loader.py", line 56, in loadTestsFromTestCase
    loaded_suite = self.suiteClass(map(testCaseClass, testCaseNames))
TypeError: __init__() takes exactly 1 argument (2 given)

可是到底错在哪里呢？

[半吊子Py全栈工程师]

你这样加了__init__是重写了父类的初始化方法，父类的def __init__(self, methodName='runTest'):是传了2个参数，你传2个值， def __init__(self, methodName='runTest'): """Create an instance of the class that will use the named test method when executed. Raises a ValueError if the instance does not have a method with the specified name. """ self._testMethodName = methodName self._resultForDoCleanups = None try: testMethod = getattr(self, methodName) except AttributeError: raise ValueError("no such test method in %s: %s" % (self.__class__, methodName)) self._testMethodDoc = testMethod.__doc__ self._cleanups = [] # Map types to custom assertEqual functions that will compare # instances of said type in more detail to generate a more useful # error message. self._type_equality_funcs = {} self.addTypeEqualityFunc(dict, 'assertDictEqual') self.addTypeEqualityFunc(list, 'assertListEqual') self.addTypeEqualityFunc(tuple, 'assertTupleEqual') self.addTypeEqualityFunc(set, 'assertSetEqual') self.addTypeEqualityFunc(frozenset, 'assertSetEqual') try: self.addTypeEqualityFunc(unicode, 'assertMultiLineEqual') except NameError: # No unicode support in this build pass

[欢乐的小猪]

https://blog.csdn.net/hbu_pig/article/details/79649195

[欢乐的小猪]

基类有两个参数。改后代码：

import unittest
class mytest(unittest.TestCase):
    def __init__(self,methodName='runTest'):
		super(mytest,self).__init__(methodName)
		print '__init__'
    def setUp(self):
        print 'setup'
        pass
    def tearDown(self):
        print 'tearDown'
        pass
    def testTrue(self):
        self.assertTrue(True)
if __name__=="__main__":
    unittest.main()