Modify XML file using ElementTree



I am trying to do the folowing with Python:



  • get "price" value and change it

  • find "price_qty" and insert new line with new tier and different price based on the "price".

  • so far I could only find the price and change it and insert line in about correct place but I can't find a way how to get there "item" and "qty" and "price" attributes, nothing has worked so far...


this is my original xml:



<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<body start="20.04.2014 10:02:60">
<pricelist>
<item>
<name>LEO - red pen</name>
<price>31,4</price>
<price_snc>0</price_snc>
<price_ao>0</price_ao>
<price_qty>
<item qty="150" price="28.20" />
<item qty="750" price="26.80" />
<item qty="1500" price="25.60" />
</price_qty>
<stock>50</stock>
</item>
</pricelist>


the new xml should look this way:



<pricelist>
<item>
<name>LEO - red pen</name>
<price>31,4</price>
<price_snc>0</price_snc>
<price_ao>0</price_ao>
<price_qty>
<item qty="10" price="31.20" /> **-this is the new line**
<item qty="150" price="28.20" />
<item qty="750" price="26.80" />
<item qty="1500" price="25.60" />
</price_qty>
<stock>50</stock>
</item>
</pricelist>


my code so far:



import xml.etree.cElementTree as ET
from xml.etree.ElementTree import Element, SubElement

tree = ET.ElementTree(file='pricelist.xml')
root = tree.getroot()
pos=0

# price - raise the main price and insert new tier
for elem in tree.iterfind('pricelist/item/price'):
price = elem.text
newprice = (float(price.replace(",", ".")))*1.2

newtier = "NEW TIER"
SubElement(root[0][pos][5], newtier)
pos+=1

tree.write('pricelist.xml', "UTF-8")


result:



...
<price_qty>
<item price="28.20" qty="150" />
<item price="26.80" qty="750" />
<item price="25.60" qty="1500" />
<NEW TIER /></price_qty>


thank you for any help.


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