通过使用lxml删除特殊字符来更新属性值

Question

Getting ID attribute and updating its value

for elem in doc.xpath('//@id',namespaces={'leg':'http://www.lexis-nexis.com/glp/leg'}):
                s = str(elem)
                replaced = re.sub(r'([^a-zA-Z0-9\.\_])','',s)
                elem=replaced 

I am getting updated value in value replaced but elem is not updated neither the xml in which i am writing this value.

Answer 1

You can iterate through elements that have id attributes instead, and then update the attribute value, like so :

for elem in doc.xpath('//*[@id]', namespaces={'leg':'http://www.lexis-nexis.com/glp/leg'}):
    elem.attrib['id'] = re.sub(r'([^a-zA-Z0-9\.\_])', '', elem.attrib['id'])

# don't forget to write changes back to the disk if necessary