NameError: name ‘time‘ is not defined

引入Import time这个包即可

import unittest
import time
class TestDemo(unittest.TestCase):
    @classmethod
    def setUp(self) -> None:
        print("每一个测试用例之前会自动执行")
    @classmethod
    def tearDown(self) -> None:
        print("====每一个测试用例执行之后都会自动执行一次====")
    @classmethod
    def setUpClass(cls) -> None:
        print("测试类执行开始的时候执行一次")
    @classmethod
    def tearDownClass(cls) -> None:
        print("测试类执行完成后，只执行一次")
        time.sleep(2)
    def test_01(self):
        print("test_01")
        time.sleep(2)
    def test_02(self):
        print("test_02")
        time.sleep(3)
    def test_03(self):
        print("test_03")
    def test_04(self):
        print("test_04")
    def test_05(self):
        print("test_05")
if __name__ == "__main__":
    unittest.main()