Cant set api response as tree in Element tree

[snippsat]

All of code is inside the function then after return nothing happens with lines 17-23.
Here a fix an i use BS with lxml as parser,i never use parser in standard library.

import requests
from bs4 import BeautifulSoup

def get_xml():
    url="http://energywatch.natgrid.co.uk/EDP-PublicUI/PublicPI/InstantaneousFlowWebService.asmx"
    headers = {'content-type': 'application/soap+xml; charset=utf-8'}
    body ="""<soap12:Envelope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:soap12="http://www.w3.org/2003/05/soap-envelope">
                <soap12:Body>
                <GetInstantaneousFlowData xmlns="http://www.NationalGrid.com/EDP/UI/" />
                </soap12:Body>
                </soap12:Envelope>"""

    response = requests.post(url,data=body,headers=headers)
    return response.content

response = get_xml()
soup = BeautifulSoup(response, 'lxml')
for item in soup.find_all('EDPObjectName'.lower()):
    print(item.text)

Output:
ALDBROUGH
AVONMOUTH
BACTON BBL
BACTON IC
BACTON PERENCO
BACTON SEAL
BACTON SHELL
BARROW SOUTH
DYNEVOR ARMS
EASINGTON DIMLINGTON
EASINGTON LANGELED
EASINGTON ROUGH ST
.......