如何切换webview进入小程序请参考https://testerhome.com/topics/12003

脚本思路：
进入webview后会存在多个handle同Web页签一样，获取所有的handle，然后在遍历所有的handle，通过switch_to_window进行handle切换，当某个handle可以定位到我们需要定位的元素时，然后我们就可以进行之后的自动化操作了！

1.  

   <code style="font-family:Menlo, Monaco, Consolas, 'Courier New', monospace;line-height:18px;font-size:12px;color:rgb(68,68,68);border:none;">#coding=utf-8
2.  

   from appium import webdriver
3.  

   import time,os,re
4.  

   from appium.webdriver.common.touch_action import TouchAction
5.   
6.   
7.  

   desired_caps = {}
8.  

   desired_caps['platformName'] = 'Android'
9.  

   desired_caps['deviceName'] = 'Android001'
10.  

    desired_caps['unicodeKeyboard'] = True
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    desired_caps["resetKeyboard"] = True
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    desired_caps["newCommandTimeout"]=30
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    desired_caps['fullReset'] = 'false'
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    desired_caps['appPackage'] = 'com.tencent.mm'
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    desired_caps['appActivity'] = 'com.tencent.mm.ui.LauncherUI'
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    desired_caps['recreateChromeDriverSessions'] = True
17.  

    desired_caps['noReset'] = True
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    desired_caps['newCommandTimeout'] = 10
19.  

    desired_caps['chromeOptions']={'androidProcess': 'com.tencent.mm:appbrand0'}
20.  

    driver = webdriver.Remote(command_executor = 'http://127.0.0.1:4723/wd/hub',desired_capabilities = desired_caps)
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    time.sleep(2)
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    time.sleep(1)
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    driver.implicitly_wait(10)
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    driver.find_element_by_name('发现').click()
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    time.sleep(1)
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    driver.swipe(100,1200,100,900)
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    driver.find_element_by_name('小程序').click()
28.  

    driver.find_element_by_name('美团外卖').click()
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    time.sleep(2)
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    contexts = driver.contexts
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    print contexts
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    time.sleep(2)
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    driver.switch_to.context('WEBVIEW_com.tencent.mm:appbrand0')
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    print '切换成功'
35.  

    print driver.current_context
36.  

    all_handles = driver.window_handles
37.  

    print len(all_handles)
38.  

    for handle in all_handles:
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    try:
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    driver.switch_to_window(handle)
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    print driver.page_source
42.  

    driver.find_element_by_css_selector('.filter-select.flex-center') #定位“筛选 ”按钮
43.  

    print '定位成功'
44.  

    break
45.  

    except Exception as e:
46.  

    print e
47.  

    driver.find_element_by_css_selector('.filter-select.flex-center').click()
48.  

    time.sleep(5)
49.  

    driver.quit()</code>