Blending a LaTeX document with python package pylatexenc

I want to blend a LaTeX document. I thought I would use the pylatexenc package to parse the document, then run through the input structure blend the existing text and output the resulting structure. Is there an example program that I can derive the rest from for my own? I tried it, but had difficulty making changes to the content of the individual elements, almost as if they were deepcopies.

I tried this,

walker = LatexWalker(input)
nodelist, pos, len = walker.get_latex_nodes()
...
for node in nodelist:
    process_node(node)
...
for node in nodelist:
    output.write(node.latex_verbatim())

but had difficulty making changes to the content of the individual elements, almost as if they were deepcopies. Output was the same as input 🙁

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