low memory lxml.etree.iterparse

fast_iter.py

from lxml import etree

def fast_iter(context, func, *args, **kwargs):
    """ call func on each xml element chosen when create context
    
    context = etree.iterparse('path to file', tag='your tag', events)
    """
    for event, elem in context:
        func(elem, *args, *kwargs)
        elem.clear()
        while elem.getprevious() is not None:
            del elem.getparent()[0]
    del context