除去所有尖括号里的内容
string = '<em>学习宝</em>'
p = re.findall('<[^>]+>|</[^>]+>',string)
for i in p:
string = string.replace(i, '')
string = '<em>学习宝</em>'
p = re.findall('<[^>]+>|</[^>]+>',string)
for i in p:
string = string.replace(i, '')