如何使用Python删除SVG文件中的不可见元素？

Question

How can I clean up SVG files by removing invisible objects or layers with a Python script. Such elements have at least one of the following styles set:

display: none
opacity: 0
visibility: hidden

I'm considering to use a Regex pattern, but given the complexity of XML, Regex is usually discouraged here.

Would it be an option to use lxml? I can do some HTML modifications, but I'm not sure about SVG and how to properly save the modified data to the file.

Answer 1

Done it:

from lxml import etree
doc = etree.parse('/test.svg')
for action, el in etree.iterwalk(doc):
    if el.attrib.get('display', None) == 'none' or el.attrib.get('visibility', None) == 'hidden' or el.attrib.get('opacity', None) == '0':
        el.clear()
with open('/test_out.svg', 'w') as f:
    f.write(u'<?xml version="1.0" encoding="UTF-8"?>\n'+etree.tostring(doc, pretty_print=True))

I hope that will catch all cases.