Python 2.7 UnicodeDecodeError在获取Url时出错

我对python 2.7非常陌生，使用urilib2从URL读取数据并写入普通txt文件

webPage = urllib2.urlopen('https://www.somewebsite.com').read()
soup = BeautifulSoup(webPage)
urlData= open("urlData.txt","a+")
div  = soup.find("div",{"class":"imgMrgnTopLG imgMrgnBtmLG listBullet"})

for row in div.findAll('ul'): 
        for li in row.findAll('li'):
             if any( ext in li.text.encode('utf-8') for ext in keys):
                    urlData.write(li.text.encode('utf-8')+"\n")  

在执行上述代码时，我遇到了这个错误，我尝试了以前的解决方案，但无法修复。请帮帮我，先谢谢你

UnicodeDecodeError: 'ascii' codec can't decode byte 0xc3 in position 5: ordinal not in range(128)