执行结果显示：Process finished with exit code 0

现象：
（1）运行后，appium server 未看到有运行的日志
（2）打断点走到 def setup(self):后就结束了
（3）但在终端用 py.test 运行这个文件对应真机能正常启动，appium server 也能看到运行日志
（4）写了一个简单的 print("helloword") 能正常打印出来
试了下百度上的修改解释器等等都无效，前来求助各位大神

代码如下：

from appium import webdriver
from selenium.webdriver.support.wait import WebDriverWait

class TestDemo:
    def setup(self):
        desired_cap = {
        "platformName" : "android",
        "deviceName" : "xiaomi",
        "appPackage" : "com.xueqiu.android",
        "appActivity" : "view.WelcomeActivityAlias",
        "autoGrantPermissions" : "true"}


        self.driver = webdriver.Remote("http://localhost:4723/wd/hub", desired_cap)
        self.driver.implicitly_wait(20)

        def loaded(driver):
           if len(self.driver.find_elements_by_id("image_cancel")) >=1:
               self.driver.find_element_by_id("image_cancel").click()
               return True
           else:
               return False
        try:
           WebDriverWait(self.driver,15).until(loaded)
        except:
           print("no update")


    def test_xpath(self):
        self.driver.find_element_by_xpath("//*[@text='同意' and contains(@resource-id,'com.xueqiu.android:id/tv_agree')]").click()

    def demo(self):
        el1 = self.driver.find_element_by_id("com.xueqiu.android:id/home_search")
        el1.click()
        el2 = self.driver.find_element_by_id("com.xueqiu.android:id/search_input_text")
        el2.send_keys("aaa")

    def teardown(self):
        self.driver.quit()