python3 debian parsing

tocsv.py

import os,json,csv
from os.path import join, getsize

header = True
with open('status.csv', 'w', newline='') as csvfile:
    c = csv.writer(csvfile)
    for root, dirs, files in os.walk('pool'):
        for filename in files:
            with open(join(root,filename)) as fp:
                r = json.load(fp)
                keys = sorted(r.keys())
                if header:
                    c.writerow(['filename']+keys)
                    header = False
                c.writerow([filename]+[key if r[key] else '' for key in keys])