测试类执行报错：AttributeError: 'Testlei' object has no attribute 'test_cases' 和data，unpack用法解析

a=[{"}]
import unittest
from ddt import ddt,data,unpack

@ddt
class Testlei(unittest.TestCase):
    def setUp(self):
        print("开始")
    # ([{"步骤":"123",'结果':"123","预期":"3"},{"步骤":"1",'结果':"1","预期":"1"}])
    @data(*a)#({"步骤":"123",'结果':"123","预期":"3"},{"步骤":"1",'结果':"1","预期":"1"})
    def test_cases(self,d):
        print(d["预期"])
    def tearDown(self):
        print("结束")
if __name__ == '__main__':
    Testlei().test_cases()

C:\Users\Administrator\AppData\Local\Programs\Python\Python36\python.exe E:/yzm_pj/test_a.py
Traceback (most recent call last):
  File "E:/yzm_pj/test_a.py", line 55, in <module>
    Testlei().test_cases()
AttributeError: 'Testlei' object has no attribute 'test_cases'

原因如下，右键执行的时候只显示模块，没有uninttest

解决方法：

方法一：用unitest.main()执行

a=[{"}]
import unittest
from ddt import ddt,data,unpack

@ddt
class Testlei(unittest.TestCase):
    def setUp(self):
        print("开始")
    # ([{"步骤":"123",'结果':"123","预期":"3"},{"步骤":"1",'结果':"1","预期":"1"}])
    @data(*a)#({"步骤":"123",'结果':"123","预期":"3"},{"步骤":"1",'结果':"1","预期":"1"})
    def test_cases(self,d):
        print(d["预期"])
    def tearDown(self):
        print("结束")
if __name__ == '__main__':
    unittest.main()

方法二：点击pycharm菜单栏的run按钮

切换unitest

执行成功

unpack

a=[{"}]
import unittest
from ddt import ddt,data,unpack

@ddt
class Testlei(unittest.TestCase):
    def setUp(self):
        print("开始")
    # ([{"步骤":"123",'结果':"123","预期":"3"},{"步骤":"1",'结果':"1","预期":"1"}])
    @data(*a)#({"步骤":"123",'结果':"123","预期":"3"},{"步骤":"1",'结果':"1","预期":"1"})
    @unpack# 再将{"步骤":"123",'结果':"123","预期":"3"}和{"步骤":"1",'结果':"1","预期":"1"}拆分
           # 以逗号作为拆分点，可以拆分多少个，就用几个参数接收。
    def test_cases(self,aa,bb,cc):#aa,bb,cc接收必须是key名
        fact=3#给定一个实际结果
        try:
           self.assertEqual(int(cc),fact)
           print("比对成功{}与{}相等".format(int(cc),fact))
        except Exception as e:
            print("比对失败{}与{}不相等".format(int(cc),fact))
            raise e
    def tearDown(self):
        print("结束")
if __name__ == '__main__':
    Testlei().test_cases()

运行结果