[Python] None type when parsing xml data in Python

I'd like to be able to parse some info from xml data while uses namespaces. I have been trying to read/follow steps in: https://docs.python.org/3/library/xml.etree.elementtree.html#parsing-xml-with-namespaces

This is a sample of how my xml looks like

When I try going through xml tree using a nested for loop, it looks like my code can read the sub-elements successfully.

def toXML(s):
xmlRoot= ET.fromstring(s)

for child in xmlRoot:
print(child.tag)
for subchild in child:
print(subchild.tag)
for subchild in subchild:
print(subchild.tag)


Output:

{http://www.w3.org/2003/05/soap-envelope}Body
{http://www.onvif.org/ver10/search/wsdl}GetRecordingSummaryResponse
{http://www.onvif.org/ver10/search/wsdl}Summary

Process finished with exit code 0


However, when I try to do this the nice way

for child in xmlRoot.find('{http://www.onvif.org/ver10/search/wsdl}Summary'):
NumberRecordings=child.find('{http://www.onvif.org/ver10/schema}NumberRecordings')
print(NumberRecordings.text)


I get this error:

for child in xmlRoot.find('{http://www.onvif.org/ver10/search/wsdl}Summary'):
~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
TypeError: 'NoneType' object is not iterable


Any idea why my child is None ?

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