如何使BeautifulSoup XMLFormatter保留实体

Question

我需要保留XML文档中属性的顺序。 根据文档，我尝试了以下方法

from bs4 import BeautifulSoup
from bs4.formatter import XMLFormatter

class UnsortedAttributes(XMLFormatter):
    def attributes(self, tag):
        for k, v in tag.attrs.items():
            yield k, v

soup = BeautifulSoup('<p foo="1" bar="2">&amp;</p>', 'xml')
print(soup.encode(formatter=UnsortedAttributes()))

这将输出<p foo="1" bar="2">&</p>，将&转换为&。 如何保留实体

Answer 1

我找到了解决办法

from bs4 import BeautifulSoup
from bs4.formatter import XMLFormatter
from bs4.dammit import EntitySubstitution

class UnsortedAttributes(XMLFormatter):
    def __init__(self, *args, **kwargs):
        return super(XMLFormatter, self).__init__(
            entity_substitution=EntitySubstitution.substitute_xml)

    def attributes(self, tag):
        for k, v in tag.attrs.items():
            yield k, v

soup = BeautifulSoup('<p foo="1" bar="2">&amp;</p>', 'xml')
print(soup.encode(formatter=UnsortedAttributes()))