appium 判断app是否安装

 #coding:utf-8
 #Import the common package
 import os
 import unittest
 from appium import webdriver
 from time import sleep
 
 #设置路径信息
 PATH = lambda p: os.path.abspath(
     os.path.join(os.path.dirname(__file__), p)
 )
 
 class LoginAndroidTests(unittest.TestCase):
     def setUp(self):
         #初始化测试平台
         desired_caps = {}
         desired_caps['platformName'] = 'Android'
         desired_caps['platformVersion'] = '4.4.2'
         desired_caps['deviceName'] = '127.0.0.1:62001'
         #desired_caps['app'] = 'D:\apk\xx.apk'
         desired_caps['appPackage'] = 'com.lovebizhi.wallpaper'
         desired_caps['appActivity'] = 'com.lovebizhi.wallpaper.WelcomeActivity'
         self.driver = webdriver.Remote('http://127.0.0.1:4723/wd/hub', desired_caps)
 
     def tearDown(self):
 
         self.driver.quit()
 
     def test_1(self):
         #测试导航页
         print("start test1...")
 
         #判断是否安装爱壁纸APP
         wallpaper = self.driver.is_app_installed("com.lovebizhi.wallpaper")
         if wallpaper:
             #self.driver.remove_app("com.lovebizhi.wallpaper")
             sleep(8)
             # 点击某一壁纸图片
             self.driver.find_elements_by_id("com.lovebizhi.wallpaper:id/image1")[4].click()
             sleep(4)
             # 点击设置壁纸
             self.driver.find_element_by_id("com.lovebizhi.wallpaper:id/btSetup").click()
             sleep(5)
         else:
             self.driver.install_app("D:\apk\xx.apk")
             sleep(30)
 
     def test_2(self):
         #测试导航页
         print("start test2")
 
         #判断是否安装爱壁纸APP
         wallpaper = self.driver.is_app_installed("com.lovebizhi.wallpaper")
         #是
         if wallpaper:
             sleep(8)
             # 点击某一壁纸图片
             self.driver.find_elements_by_id("com.lovebizhi.wallpaper:id/image1")[5].click()
             sleep(4)
             # 点击设置壁纸
             self.driver.find_element_by_id("com.lovebizhi.wallpaper:id/btSetup").click()
             sleep(5)
         #否，安装
         else:
             self.driver.install_app("D:\apk\xx.apk")
             sleep(30)
 
 if __name__ == '__main__':
     suite =unittest.TestLoader().loadTestsFromTestCase(LoginAndroidTests)
     unittest.TextTestRunner(verbosity=2).run(suite)