Change tab spacing in python lxml prettyprint

user_6749743 0
Viewed 2219

I have a small script that creates an xml document and using the prettyprint=true it makes a correctly formatted xml document. However, the tab indents are 2 spaces, and I am wondering if there is a way to change this to 4 spaces (I think it looks better with 4 spaces). Is there a simple way to implement this?

Code snippet:

doc = lxml.etree.SubElement(root, 'dependencies')
for depen in dependency_list:
    dependency = lxml.etree.SubElement(doc, 'dependency')
    lxml.etree.SubElement(dependency, 'groupId').text = depen.group_id
    lxml.etree.SubElement(dependency, 'artifactId').text = depen.artifact_id
    lxml.etree.SubElement(dependency, 'version').text = depen.version
    if depen.scope == 'provided' or depen.scope == 'test':
        lxml.etree.SubElement(dependency, 'scope').text = depen.scope
    exclusions = lxml.etree.SubElement(dependency, 'exclusions')
    exclusion = lxml.etree.SubElement(exclusions, 'exclusion')
    lxml.etree.SubElement(exclusion, 'groupId').text = '*'
    lxml.etree.SubElement(exclusion, 'artifactId').text = '*'
tree.write('explicit-pom.xml' , pretty_print=True)
lxml pretty-print xml python
2 Answers

If someone is still trying to achieve this, it can be done using etree.indent() method in lxml 4.5 -

>>> etree.indent(root, space="    ")
>>> print(etree.tostring(root))
<root>
    <a>
        <b/>
    </a>
</root>

https://lxml.de/tutorial.html#serialisation

user_54234500

This doesn't seem to be possible by the python lxml API.

A possible solution for tab spacing would be:

def prettyPrint(someRootNode):
    lines = lxml.etree.tostring(someRootNode, encoding="utf-8", pretty_print=True).decode("utf-8").split("\n")
    for i in range(len(lines)):
        line = lines[i]
        outLine = ""
        for j in range(0, len(line), 2):
            if line[j:j + 2] == "  ":
                outLine += "\t"
            else:
                outLine += line[j:]
                break
        lines[i] = outLine
    return "\n".join(lines)

Please note that this is not very efficient. High efficiency can only be achieved if this functionality is natively implemented within the lxml C code.

user_51325090
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