import json
import os
import xlwt
import threading

def json_to_xls(i):
    wb = xlwt.Workbook()
    ws = wb.add_sheet('sheet 1')
    ws.write(0, 0, 'Type:')
    ws.write(0, 1, 'Project Id:')

    with open(i, 'r', encoding='utf-8') as fh:
        data = json.load(fh)

    l = 1
    for d in data:
        ws.write(l, 0, d.get('type'))
        ws.write(l, 1, d.get('project_id'))
        l += 1

    wb.save(i + '.xls')

files = os.listdir()
thread_list = []
value = 0

thread_list = []
for i in files:
    json_file = i.endswith('.json')
    if json_file == True:
        t = threading.Thread(target = json_to_xls, name = value, args = i)
        value += 1
        t.start()
        thread_list.append(t)
        print(i)
        converter_json(i)

for t in thread_list:
    t.join()

TypeError: json_to_xls() takes 1 positional argument but 21 were given