The PerWorldInventory plugin deleted a bunch of items from players, this script manually spawns in the items from the server's config/backup files.

pwi-mc-restore.py

import json

USERNAME = '<adminname>'
BACKUP = '<backup_file>.json'

def parse_item_json(item_json):
    name = item_json['item']['type']
    amt = item_json['item'].get('amount', 1)
    return name, amt

with open(BACKUP, 'r') as f:
    data = json.load(f)

items = []
for item in data['ender-chest']:
    items.append(parse_item_json(item))
for item in data['inventory']['contents']:
    items.append(parse_item_json(item))
for item in data['inventory']['armor']:
    items.append(parse_item_json(item))

import keyboard, time
time.sleep(5)
i = 0
for name, amt in items:
    if name == 'AIR':
        continue
    cmd = 'give {} {} {}'.format(USERNAME, name.lower(), amt)
    print(cmd)
    keyboard.send('/')
    time.sleep(0.5)
    keyboard.write(cmd + '\n')
    time.sleep(0.5)
    i += 1
    if i % 27 == 0:
        time.sleep(10)