def METHOD_NAME(seed, offer_index):
    """accept_sell_offer"""
    buyer_wallet=Wallet.from_seed(seed)
    client=JsonRpcClient(testnet_url)
    accept_offer_tx=xrpl.models.transactions.NFTokenAcceptOffer(
       account=buyer_wallet.classic_address,
       nftoken_sell_offer=offer_index
    )