[Python] generate xml file using ElementTree API

I'm trying to generate the below XML file using the data populated in a list

XML format

<?xml version="1.0" encoding="UTF-8"?>
<testsuites tests="65" failures="0" disabled="0" errors="0" name="AllTests">
<testsuite name="Tests" tests="65" failures="0" disabled="0" skipped="0" errors="0">
<testcase name="TestInit" file="" status="run" result="completed" />
<testcase name="TestAlways" file="" status="run" result="completed" />
</testsuite>
...
</testsuites>


main.py

import xml.etree.cElementTree as ET

class TestCase:
def __init__(self, name, result):
self.name = name
self.result = result

def __str__(self):
return f"Test Case: {self.name}, Status: {self.result}"

class TestSuite:
def __init__(self, name):
self.name = name
self.test_case_list = []

def __str__(self):
return f"Test Suite: {self.name}"

def main():
print("Hello from html-test-report-generator!")
test_suite_list = generate_html_report()
for test_suite in test_suite_list:
print(test_suite)
for test_case in test_suite.test_case_list:
print(test_case)
print()
generate_xml(test_suite_list)

def generate_html_report():
# generates a list of TestSuite objects and returns the list back to the caller

def generate_xml(test_suite_list):
testsuites = ET.Element("testsuites", tests=len(test_suite_list), failures="0", disabled="0", errors="0", name="AllTests")
for test_suite in test_suite_list:
testsuite = ET.SubElement(testsuites, "testsuite", name=test_suite.name, tests=len(test_suite.test_case_list), failures="0", disabled="0", skipped="0", errors="0")
for test_case in test_suite.test_case_list:
ET.SubElement(testsuite, "testcase", name=test_case.name, file="", line="", status="run", result=test_case.result)
tree = ET.ElementTree(testsuites)
tree.write("filename.xml")


Error

Traceback (most recent call last):
File "/usr/lib/python3.12/xml/etree/ElementTree.py", line 743, in _get_writer
write = file_or_filename.write
^^^^^^^^^^^^^^^^^^^^^^
AttributeError: 'str' object has no attribute 'write'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "/home/harsha/html_test_report_generator/main.py", line 94, in <module>
main()
File "/home/harsha/html_test_report_generator/main.py", line 28, in main
generate_xml(test_suite_list)
File "/home/harsha/html_test_report_generator/main.py", line 37, in generate_xml
tree.write("filename.xml")
File "/usr/lib/python3.12/xml/etree/ElementTree.py", line 729, in write
serialize(write, self._root, qnames, namespaces,
File "/usr/lib/python3.12/xml/etree/ElementTree.py", line 885, in _serialize_xml
v = _escape_attrib(v)
^^^^^^^^^^^^^^^^^
File "/usr/lib/python3.12/xml/etree/ElementTree.py", line 1050, in _escape_attrib
_raise_serialization_error(text)
File "/usr/lib/python3.12/xml/etree/ElementTree.py", line 1004, in _raise_serialization_error
raise TypeError(
TypeError: cannot serialize 23 (type int)

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