问美丽的汤没有正确解析xml标记，但lxml正确

EN

import requests
from bs4 import BeautifulSoup
url = 'https://eutils.ncbi.nlm.nih.gov/entrez/eutils/einfo.fcgi?retmode=xml&db=pmc'

response = requests.get(url)

soup = BeautifulSoup(response.text,'lxml')
links =  soup.find_all('link')

<link/>
<name>pmc_sra</name>
<menu>SRA</menu>
<description>Links to SRA</description>
<dbto>sra</dbto>
<link/>
<name>pmc_structure</name>
<menu>Structure Links</menu>
<description>Published 3D structures</description>
<dbto>structure</dbto>
<link/>

<Link>
    <Name>pmc_sra</Name>
    <Menu>SRA</Menu>
    <Description>Links to SRA</Description>
    <DbTo>sra</DbTo>
</Link>
<Link>
    <Name>pmc_structure</Name>
    <Menu>Structure Links</Menu>
    <Description>Published 3D structures</Description>
    <DbTo>structure</DbTo>
</Link>
<Link>

from lxml import etree
#root = etree.fromstring(response.text)
root = etree.fromstring(response.text.encode('utf-8'),parser=etree.XMLParser(encoding='utf-8'))

for link in root.iter("Link"):
    etree.dump(link)

<Link>
    <Name>pmc_sra</Name>
    <Menu>SRA</Menu>
    <Description>Links to SRA</Description>
    <DbTo>sra</DbTo>
</Link>

<Link>
    <Name>pmc_structure</Name>
    <Menu>Structure Links</Menu>
    <Description>Published 3D structures</Description>
    <DbTo>structure</DbTo>
</Link>