Retail Price Tag Generator Agent

import json, math

products = [
  {"name":"Kemeja Cotton","price":49.90,"discount":0},
  {"name":"Kasut Sukan","price":159.00,"discount":"20%"},
  {"name":"Jam Tangan","price":89.00,"discount":"15%"},
  {"name":"Set PROMO","price":199.00,"discount":"Bundle 30%"}
]

def calc_discount(price, disc):
    if disc == 0 or disc == "0": return price
    pct = float(str(disc).replace("Bundle ","").replace("%",""))
    return round(price * (1 - pct/100), 2)

def gen_barcode(prefix, idx):
    raw = prefix + str(idx).zfill(3)
    chk = sum(int(d)*3 if i%2 else int(d) for i,d in enumerate(raw))%10
    chk = (10-chk)%10
    return raw + str(chk)

def format_tag(p, idx):
    final = calc_discount(p["price"], p["discount"])
    barcode = gen_barcode("955100", idx+1)
    return {"product": p["name"], "price": p["price"],
            "final": final, "barcode": barcode}

tags = [format_tag(p,i) for i,p in enumerate(products)]
print(json.dumps(tags, indent=2))