Creating a document tree before or after adding subitems

Question

I use lxml and Python to write XML files. I was wondering what the accepted practice is: first create a document tree and then add auxiliary elements or add auxiliary elements and create a tree later? I know that this is unlikely to have any meaning in relation to the output, but I was interested to know what is the accepted norm in this from the point of view of coding.

Code example:

page = etree.Element('root')
#first create the tree
doc = etree.ElementTree(page) 
#add the subelements
headElt = etree.SubElement(page, 'head')

Or that:

page = etree.Element('root')
headElt = etree.SubElement(page, 'head')
#create the tree in the end
doc = etree.ElementTree(page) 

Answer 1

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