从ET.parse迁移到etree.iterparse

Question

Wrote a code to parse .osm file. Spend a lot of time to build a up to 50 rows code but ran into a 'Memory Error' problem. Seems like the best solution is to use interparse() instead of parse().

My question is: how should I change my code (strating of my code)

import xml.etree.ElementTree as ET
tree = ET.parse('file.osm')
root = tree.getroot()

to ( using interparse() method) (not my code)

import xml.etree.ElementTree as etree
context=etree.iterparse('file.osm', events=('start', 'end', 'start-ns', 'end-ns'))

and not to ruin rest of my code (only part of my code)

list=[]
for i in root.findall('node'):  
    lat=i.get('lat')
    lon=i.get('lon')
    dict = {}
    for ii in i:        
        dict['lat']=lat
        dict['lon']=lon     
        key=ii.get('k')
        val=ii.get('v')     
        dict[key]=val       
    if len(dict)>0:
        list.append(dict)

Answer 1

tree = ET.iterparse('file.osm')
root = tree.root

this will give you the tree root. from there it is the same as parse