Python 不会将 \r\n 写入 XML 文件

Question

I am using python to generate XML files. The XML files have attributes that require \r\n to denote a line break (regular \n will not work for this application). Here's an example of the XML file I am trying to generate:

<root>
    <tag attrib="multiple&#13;&#10;lines&#13;&#10;here"></tag>
</root>

Note the 
 is the XML escape character encoding for \n and 
 is \r .

Here is my python code to generate this XML file:

import xml.etree.ElementTree as ET


root = ET.Element('root')
tag = ET.SubElement(root, 'tag')
tag.set('attrib', 'multiple\r\nlines\r\nhere')

xml_file = 'test.xml'
tree = ET.ElementTree(root)
tree.write(xml_file)

Output: <root><tag attrib="multiple&#10;lines&#10;here" /></root>

It is clear that the \r is stripped from the output XML. How can I add \r\n to my XML files?

Answer 1

After a few hours of searching for this, I eventually found that it is a bug in the XML package (See https://bugs.python.org/issue39011 ). From what I can tell on the cpython github page, this is fixed on Python 3.9, but not any earlier versions. For versions without the bug fix, here is a workaround I've used:

with open(xml_file, 'r') as f:
    lines = f.read()

with open(xml_file, 'w') as f:
    lines = f.write(lines.replace('
', '
')

After you create an XML file without \r\n , you open it and replace any occurrences of \n in the attributes with \r\n .