ddt運行測試方法時報錯AttributeError: type object 'TestHttpRq' has no attribute 'test_http_rq_login'

import unittest
import ddt  #裝飾器
from ddt import ddt,data,unpack #導入ddt中的各個模塊
from homework.unittest_http_request_20190321.Method_http_request import *

@ddt  #裝飾測試類
class TestHttpRq(unittest.TestCase): #測試類-get請求

    @data({"mobilephone":"","pwd":"183456"},
          {"mobilephone":"18688773467","pwd":""},
          {"mobilephone": "18688773467", "pwd": "123457"},
          {"mobilephone":"18688773467","pwd":"123456"}) #裝飾方法，遍歷data中的元素
    def test_http_rq_login(self,login_data):#測試用例必須以test開頭，不然報錯
      exp = ["用戶名或密碼錯誤","登錄成功","手機號不能為空","密碼不能為空"]
      res = HttpRequest("get",login_data).http_request().json()['msg']
      self.assertIn(res,exp)#斷言,判斷實際值與預期值是否一致

D:\Python34\python.exe "D:\Program Files\JetBrains\PyCharm Community Edition 2017.2.3\helpers\pycharm\_jb_unittest_runner.py" --target unittest_http_rq.TestHttpRq.test_http_rq_login
Testing started at 13:10 ...
Launching unittests with arguments python -m unittest unittest_http_rq.TestHttpRq.test_http_rq_login in D:\python15期\homework\ddt_20190323

Traceback (most recent call last):
  File "D:\Program Files\JetBrains\PyCharm Community Edition 2017.2.3\helpers\pycharm\_jb_unittest_runner.py", line 35, in <module>
    main(argv=args, module=None, testRunner=unittestpy.TeamcityTestRunner, buffer=not JB_DISABLE_BUFFERING)
  File "D:\Python34\lib\unittest\main.py", line 92, in __init__
    self.parseArgs(argv)
  File "D:\Python34\lib\unittest\main.py", line 139, in parseArgs
    self.createTests()
  File "D:\Python34\lib\unittest\main.py", line 146, in createTests
    self.module)
  File "D:\Python34\lib\unittest\loader.py", line 157, in loadTestsFromNames
    suites = [self.loadTestsFromName(name, module) for name in names]
  File "D:\Python34\lib\unittest\loader.py", line 157, in <listcomp>
    suites = [self.loadTestsFromName(name, module) for name in names]
  File "D:\Python34\lib\unittest\loader.py", line 125, in loadTestsFromName
    parent, obj = obj, getattr(obj, part)
AttributeError: type object 'TestHttpRq' has no attribute 'test_http_rq_login'

Process finished with exit code 1
Empty test suite.

_{運行程序時將鼠標定位在類或者程序外運行解決，ddt只能運行整體，不能運行局部即單個測試方法}