#测试单元

#Anaconda指的是一个开源的Python发行版本，其包含了conda、Python等180多个科学包及其依赖项 import unittest  #测试单元class TestAddition(unittest.TestCase):    def setUp(self):  #开始        print('Setting up the test')        print(1)    def tearDown(self):  #结束        print(2)        print('Tearing down the test')    def test_twoPlusTwo(self):        total = 2+2        self.assertEqual(4, total);  #断言if __name__ == '__main__':    unittest.main(argv=[''], exit=False)    %reset    #清除内存  如声明变量等之类的

# 一个线程

import threadingimport timeclass Crawler(threading.Thread):  #类    def __init__(self):  #初始化        threading.Thread.__init__(self)        self.done = False    def isDone(self):        return self.done    def run(self):        print(66)        time.sleep(5)        self.done = True          print('here')        raise Exception('Something bad happened!')t = Crawler()  #实例化t.start()  #线程开始while True:    time.sleep(1)    print(55)    if t.isDone():  #True时候        print('Done')        break    if not t.isAlive():  #线程崩溃 就重启线程        t = Crawler()        t.start()