> For the complete documentation index, see [llms.txt](https://docs.dydx.community/dydx-chain-technical-docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.dydx.community/dydx-chain-technical-docs/getting-started/developer-tools/dydx-chain-client-for-python/exmaple-2-trading-with-hrn.md).

# Exmaple #2: Trading with HRN

Simple PY example demonstrating trading with human readable numbers (HRN).

```python
import asyncio
import logging
from random import randrange
from v4_client_py.chain.aerial.wallet import LocalWallet
from v4_client_py.clients import CompositeClient, Subaccount
from v4_client_py.clients.constants import BECH32_PREFIX, Network

from v4_client_py.clients.helpers.chain_helpers import (
    OrderType, 
    OrderSide, 
    OrderTimeInForce, 
    OrderExecution,
)
from examples.utils import loadJson

from tests.constants import DYDX_TEST_MNEMONIC


async def main() -> None:
    wallet = LocalWallet.from_mnemonic(DYDX_TEST_MNEMONIC, BECH32_PREFIX)
    network = Network.testnet()
    client = CompositeClient(
        network,
    )
    subaccount = Subaccount(wallet, 0)
    ordersParams = loadJson('human_readable_orders.json')
    for orderParams in ordersParams:
        type = OrderType[orderParams["type"]]
        side = OrderSide[orderParams["side"]]
        time_in_force_string = orderParams.get("timeInForce", "GTT")
        time_in_force = OrderTimeInForce[time_in_force_string]
        price = orderParams.get("price", 1350)

        if time_in_force == OrderTimeInForce.GTT:
            time_in_force_seconds = 60
            good_til_block = 0
        else:
            latest_block = client.validator_client.get.latest_block()
            next_valid_block = latest_block.block.header.height + 1
            good_til_block = next_valid_block + 10
            time_in_force_seconds = 0

        post_only = orderParams.get("postOnly", False)
        try:
            tx = client.place_order(
                subaccount,
                market='ETH-USD',
                type=type,
                side=side,
                price=price,
                size=0.01,
                client_id=randrange(0, 100000000),
                time_in_force=time_in_force,
                good_til_block=good_til_block,
                good_til_time_in_seconds=time_in_force_seconds,
                execution=OrderExecution.DEFAULT,
                post_only=post_only,
                reduce_only=False
            )
            print('**Order Tx**')
            print(tx)
        except Exception as error:
            print('**Order Failed**')
            print(str(error))

        await asyncio.sleep(5)  # wait for placeOrder to complete


    try:
        tx = client.place_order(
            subaccount,
            market='ETH-USD',
            type=OrderType.STOP_MARKET,
            side=OrderSide.SELL,
            price=900.0,
            size=0.01,
            client_id=randrange(0, 100000000),
            time_in_force=OrderTimeInForce.GTT,
            good_til_block=0, # long term orders use GTBT
            good_til_time_in_seconds=1000,
            execution=OrderExecution.IOC,
            post_only=False,
            reduce_only=False,
            trigger_price=1000,
        )
        print('**Order Tx**')
        print(tx)
    except Exception as error:
        print('**Order Failed**')
        print(str(error))
if __name__ == '__main__':
    logging.basicConfig(level=logging.INFO)
    asyncio.get_event_loop().run_until_complete(main())
```


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