如何用python显示一个弹窗_appium golang

desired_caps_a = {'platformName': "Android",
                      'platFormVersion': "10",
                      'deviceName': "dd",
                      'udid': "648d4f29",
                      'automationName': "UiAutomator2",
                      'noReset': False,
                      'unicodeKeyboard': True,
                      'resetKeyboard': True,
                      'appPackage': "com.tencent.mm",
                      'appActivity': "com.tencent.mm.ui.LauncherUI",
                      'autoGrantPermissions': True,
                      'chromedriverExecutable': r"C:\Users\v_yddchen\Desktop\chromedriver_win32 77.0\chromedriver.exe",
                      'chromeOptions': {'androidProcess': "com.tencent.mm:toolsmp"}  # webview的进程名字，不然会报错
    }

device_a = webdriver.Remote("http://localhost:4723/wd/hub", desired_caps_a)
    my_logging = output_log(logging.DEBUG)
# toast弹窗处理
    device_a.find_element_by_android_uiautomator('new UiSelector().text("登录")').click()
    time.sleep(1)
    device_a.find_element_by_android_uiautomator('new UiSelector().textContains("用微信号")').click()
    time.sleep(1)
    username_input = device_a.find_element_by_android_uiautomator('new UiSelector().textContains("请填写微信号")')
    username_input.clear()
    username_input.send_keys('xxx')
    pwd_input = device_a.find_element_by_android_uiautomator('new UiSelector().textContains("请填写密码")')
    pwd_input.clear()
    pwd_input.send_keys('xxx')
    device_a.find_element_by_android_uiautomator('new UiSelector().text("登录")').click()
    toast_el = WebDriverWait(device_a, 5, 0.00001).\
        until(lambda x: x.find_element_by_xpath("//*[contains(@text,'正在')]"))
    # toast_el = WebDriverWait(device_a, 5, 0.000001).\
    #     until(lambda x: x.find_element_by_xpath('//*[@class="android.widget.Toast"]'))
    print(toast_el.text)
    device_a.quit()