Beautiful Soup如何提取多个class属性值？

我使用beautifulsoup来提取class的多个属性值，但['fa'，'fa-address-book-o']不是我想要的结果。

from bs4 import BeautifulSoup

html = "<i class='fa fa-address-book-o' aria-hidden='true'></i>"

soup = BeautifulSoup(html, "lxml")

h2 = soup.select("i")

print(h2[0]['class'])

打印出结果:

['fa', 'fa-address-book-o']

这个不是我想要的结果，因为需要遍历插入mysql数据库

加入列表中的所有元素，并在它们之间放置一个空格

from bs4 import BeautifulSoup

html = "<i class='fa fa-address-book-o' aria-hidden='true'></i>"

soup = BeautifulSoup(html, "lxml")

h2 = soup.select("i")

print(' '.join(h2[0]['class']))

正确结果是：

fa fa-address-book-o

完整如下：

from urllib.request import urlopen
from bs4 import BeautifulSoup
import pymysql

# 打开数据库连接
db = pymysql.connect(host='localhost', user='root', password='root', port=3306, db='pydemo')
# 使用cursor()方法获取操作游标
cursor = db.cursor()

url = "http://www.fontawesome.com.cn/faicons/"
# 请求网址
html = urlopen(url)
# 解析网页信息
soup = BeautifulSoup(html, "lxml")

h2 = soup.select("#new a")

for h2 in zip(h2):

    name = h2[0].span.next_sibling
    print(name)

    icon = ' '.join(h2[0].i['class'])
    print(icon)

    # SQL语句
    sql = 'INSERT INTO sys_icon(name,icon) values(%s,%s)'
    try:
        # 执行SQL语句
        cursor.execute(sql, (name,icon))
        # 提交到数据库执行
        db.commit()
    except:
        # 发生错误时回滚
        db.rollback()

db.close()