如何使用python计算xml特定元素编号？

Question

Hi I'm trying to know how to count specific element numbers in XML using python. please see example as following

If i wanted to count number of BBB under the first AAA what would i do ? There are 3 BBB under the first AAA as you can see.

<data>
    <AAA>  -> The first AAA
        <CCC>
            <BBB>This</BBB>
        </CCC>
        <CCC>  
            <BBB>is</BBB>
        </CCC>
        <CCC>
            <BBB>test1</BBB>
        </CCC>
    </AAA>

    <AAA>
        <CCC>
            <BBB>This is test</BBB>
        </CCC>
    </AAA>

    <AAA>
        <CCC>
            <BBB>222222</BBB>
        </CCC>
        <CCC>
            <BBB>333333</BBB>
        </CCC>      
    </AAA>

and this is my code to count those.

a=0

for AAA in root.findall('AAA')[a]:
    for CCC in AAA.findall('CCC'):
        for BBB in CCC.findall('BBB'):
            count = BBB.count()
            print(count)

but it doesn't count even though no error. What's wrong? i need some advice please.

Answer 1

Using ElementTree

Demo:

import xml.etree.ElementTree as ET
doc = ET.fromstring(data)

for AAA in doc.findall('AAA'):
    print len(AAA.findall('CCC'))

Output:

3
1
2

Answer 2

This works for me:

from xml.etree import ElementTree

xml_text = ElementTree.parse('your_file.xml')
dom = xml_text.getroot()
results = sum([1 for entry in dom.getiterator('BBB')])
print(results)