import os
import tempfile
import argparse
import json

def put(key,value):
    data = get_data()
    data.setdefault(key,[]).append(value)
    with open(storage_path, 'w') as f:
        f.write(json.dumps(data))
    return

def get(key):
    data = get_data()
    return data.get(key)

def get_data():
    if not os.path.exists(storage_path):
        return {}
    with open(storage_path, 'r') as f:
        raw_data = f.read()
        if raw_data:
            return json.loads(raw_data)
        return {}


parser = argparse.ArgumentParser()
parser.add_argument('--key')
parser.add_argument('--val')
args = parser.parse_args()

storage_path = os.path.join(tempfile.gettempdir(), 'storage.data')


if args.key is None:
    f = open(storage_path, 'w')
    f.truncate()
elif args.val and args.key:
    put(args.key, args.val)
elif args.key:
    print(get(args.key))
else:
    print('Wrong command')