Python 3 - 无法使用 re 库进行打印

我有这个代码：

import requests
from bs4 import BeautifulSoup
import re


url = "http://www.rockefeller.edu/research/areas/summary.php?id=1"
r = requests.get(url)
soup = BeautifulSoup(r.content, 'html.parser')
for x in (soup.find_all(string=re.compile('comment'))):
    print(x.parent)
    print(x.parent.name)

当我听说它应该打印时，它什么也没打印出来<a href="/about/comments">Comments</a> and a我在用：
请求：2.7.0
美丽汤4：4.4.0
蟒蛇：3.4.3
在 python Idle 上运行：Macbook Pro

re.compile()默认情况下区分大小写。你必须设置标志re.I https://docs.python.org/2/library/re.html#re.I使其不区分大小写。请参阅以下演示示例：

import requests
from bs4 import BeautifulSoup
import re


url = "http://www.rockefeller.edu/research/areas/summary.php?id=1"
r = requests.get(url)
soup = BeautifulSoup(r.content, 'html.parser')

for x in (soup.find_all(True,text=re.compile(r'comment', re.I))):
    print(x)

output :

<a href="/about/comments">Comments</a>