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The Python Stellar SDK library provides APIs to build transactions and connect to Horizon.

Project description

GitHub Action Read the Docs Codecov Code Climate maintainability PyPI Python - Version PyPI - Implementation Stellar Protocol Horizon Version

py-stellar-sdk is a Python library for communicating with a Stellar Horizon server. It is used for building Stellar apps on Python. It supports Python 3.6+ as well as PyPy 3.6+.

It provides:

  • a networking layer API for Horizon endpoints.
  • facilities for building and signing transactions, for communicating with a Stellar Horizon instance, and for submitting transactions or querying network history.

Documentation

py-stellar-sdk’s documentation can be found at https://stellar-sdk.readthedocs.io.

Installing

Install and update using pipenv or pip:

pip install stellar-sdk==2.6.2

A Simple Example

  • Building transaction with synchronous server
# Alice pay 10.25 XLM to Bob
from stellar_sdk import Server, Keypair, TransactionBuilder, Network

alice_keypair = Keypair.from_secret("SBFZCHU5645DOKRWYBXVOXY2ELGJKFRX6VGGPRYUWHQ7PMXXJNDZFMKD")
bob_address = "GA7YNBW5CBTJZ3ZZOWX3ZNBKD6OE7A7IHUQVWMY62W2ZBG2SGZVOOPVH"

server = Server("https://horizon-testnet.stellar.org")
alice_account = server.load_account(alice_keypair.public_key)
base_fee = server.fetch_base_fee()
transaction = (
    TransactionBuilder(
        source_account=alice_account,
        network_passphrase=Network.TESTNET_NETWORK_PASSPHRASE,
        base_fee=base_fee,
    )
    .add_text_memo("Hello, Stellar!")
    .append_payment_op(bob_address, "10.25", "XLM")
    .build()
)
transaction.sign(alice_keypair)
response = server.submit_transaction(transaction)
print(response)
  • Building transaction with asynchronous server
# Alice pay 10.25 XLM to Bob
import asyncio

from stellar_sdk import Server, Keypair, TransactionBuilder, Network
from stellar_sdk.client.aiohttp_client import AiohttpClient

alice_keypair = Keypair.from_secret("SBFZCHU5645DOKRWYBXVOXY2ELGJKFRX6VGGPRYUWHQ7PMXXJNDZFMKD")
bob_address = "GA7YNBW5CBTJZ3ZZOWX3ZNBKD6OE7A7IHUQVWMY62W2ZBG2SGZVOOPVH"


async def payment():
    async with Server(
        horizon_url="https://horizon-testnet.stellar.org", client=AiohttpClient()
    ) as server:
        alice_account = await server.load_account(alice_keypair.public_key)
        base_fee = await server.fetch_base_fee()
        transaction = (
            TransactionBuilder(
                source_account=alice_account,
                network_passphrase=Network.TESTNET_NETWORK_PASSPHRASE,
                base_fee=base_fee,
            )
            .add_text_memo("Hello, Stellar!")
            .append_payment_op(bob_address, "10.25", "XLM")
            .build()
        )

        transaction.sign(alice_keypair)
        response = await server.submit_transaction(transaction)
        print(response)


if __name__ == "__main__":
    asyncio.run(payment())

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