pip 安装Selenium Web driver Python 客户端库
1. 访问天气查询网站（网址如下），查询江苏省天气
http://www.weather.com.cn/html/province/jiangsu.shtml

2. 获取江苏所有城市的天气，并找出其中每天最低气温最低的城市，显示出来，比如
温度最低为12℃, 城市有连云港 盐城]

from selenium import webdriver
#chrome驱动 执行该步骤时selenium会去到指定路径将chrome driver执行起来
driver = webdriver.Chrome(r"D:\for myself\Google\Chrome\Application\chromedriver.exe")
#get方法 打开指定网址
driver.get('http://www.weather.com.cn/html/province/jiangsu.shtml')
print(driver.get_cookies())
ele = driver.find_element_by_id('forecastID')
print(ele.text)
citysWeather = ele.text.split('℃\n')
print(citysWeather)
lowest = None #记录目前最低温，先设置为none
lowestCity = []#温度最低城市列表
for one in citysWeather:
    one = one.replace('℃','')#去掉摄氏度  南京\n25℃/34  南京\n25/34
    print(one)
    curcity = one.split('\n')[0]  #南京\n25/34 [0]代表南京
    lowweather = one.split('\n')[1].split('/')[0] #南京\n25/34 [1]代表25/34 [0]代表25
    lowweather = int(lowweather)
    #还没有最低温记录，或者发现气温更低的城市
    #注意条件不能写反
    if lowest ==None or lowweather<lowest:
        lowest = lowweather
        lowestCity = [curcity]
        #温度和当前最低相同，加入列表
    elif lowest  == lowest:
        lowestCity.append(curcity)
print('温度最低为%s℃,城市有%s'%(lowest,''.join(lowestCity)))



driver.quit()