Как из нескольких xml файлов записать только уникальное содержание тегов в один txt файл

import glob
import xml.etree.ElementTree as ET
 
paths = "*.xml"
filenames = glob.glob(paths)
 
 
with open("myfile3.txt", "w", encoding="utf-8") as output_file:
    line_count = 0
    
   
    for filename in filenames:
        with open(filename, 'r', encoding="utf-8") as content:
            tree = ET.parse(content)
            
        
        for name_element in tree.findall(".//name"): 
            name_text = name_element.text
            unique_list = list(name_text)
            def unique_list(input_list):
                  output_list = []
                  for word in input_list:
                     if word not in output_list:
                        output_list.append(word)
                  print(output_list)
                  return output_list
            print(name_text)
            output_file.write(name_text + '\n')
            line_count += 1
 
    
    
    output_file.write(f"Count of lines: {line_count}\n")
 
print(f"Count of lines: {line_count}")

items = [John, John,Mary,Paul,Lisa]
unique_items = list(set(items))
 
print(unique_items)

items = [John, John,Mary,Paul,Lisa]
unique_items = list(dict.fromkeys(items))
 
print(unique_items)

from pathlib import Path
import xml.etree.ElementTree as ET
 
directory_path = Path("test_folder")
names = list({name.text for xml_file_path in directory_path.glob('*.xml') for name in ET.parse(xml_file_path).findall(".//name")})
names.append(str(len(names)))
Path(directory_path/"myfile3.txt").write_text('\n'.join(names))

import glob
import xml.etree.ElementTree as ET
 
paths = "*.xml"
filenames = glob.glob(paths)
 
with open("myfile3.txt", "w", encoding="utf-8") as output_file:
    line_count = 0  
    output_list = []
    for filename in filenames:
        with open(filename, 'r', encoding="utf-8") as content:
            tree = ET.parse(content)
        for name_element in tree.findall(".//name"): 
            name_text = name_element.text
            if name_text not in output_list:
                output_list.append(name_text)
                print(name_text)
                output_file.write(name_text + '\n')
                line_count += 1
    
    output_file.write(f"Count of lines: {line_count}\n")
 
print(f"Count of lines: {line_count}")

output_list = []

if name_text not in output_list:
   output_list.append(name_text)

if name_text not in output_list:

output = []
for x in trends:
    if x not in output:
        output.append(x)
print(output)

output = []
for x in trends:
    if x not in output: # Если значение х не входит в список output
        output.append(x) # добавить х в output
print(output)[/quote]