def test_001_btn_login(self):

    self.startProcess_getDevicesId_StartUIAutoControl()#从此开启多进程，实现多个设备同时运行

def startProcess_getDevicesId_StartUIAutoControl(self):  # 先判断一共链接了多少设备
    cmdStr = 'adb devices'
    pi = subprocess.Popen(cmdStr, shell=True, stdout=subprocess.PIPE)
    str = pi.stdout.read()
    str1 = str.decode().split('\n')
    list1 = str1[1:-2]
    newList = []
    for i in range(len(list1)):
        dd = list1[i].split('\t')
        newList.append(dd[0])
    self.buildProcess(newList)

def buildProcess(self,newList):  # 链接多少设备开启多少进程
    phoneDic = {}
    phoneList = ['15300067679','15311926129']
    for i in range(len(newList)):
        phoneDic[newList[i]] = phoneList[i]
        p1 = Process(target=self.begin_OperateUI, args=(newList[i],),kwargs=phoneDic)
        p1.start()
        phoneDic = {}

def begin_OperateUI(self,*devicesIdParam,**phoneDicParam):
    global devicesId
    devicesId = ''.join(devicesIdParam)  # 元组转换为字符串
    start_App_Welcome(devicesId)
    d = u2.connect_usb(devicesId)  # 通过adb devices获取

def test_002_Online_listening(self):
    print(devicesId)#提示我未定义，报错

代码如上，问题是这样的，我想在执行完 case1 的时候，在 case2 中直接引用在 case1 中定义好的全局变量 devicesId，因为用例是按照循序执行的，肯定这个时候 devicesId 已经被初始化了，但是，他一直提示有错误，错误具体原因是：NameError: name 'devicesId' is not defined，请大神们帮忙看下是哪里有问题了，谢谢~