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210 lines
6.5 KiB
Markdown
210 lines
6.5 KiB
Markdown
---
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html: get-started-python.html
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funnel: Build
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doc_type: Tutorials
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category: Get Started
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blurb: Build a simple Python app that interacts with the XRP Ledger.
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cta_text: Build Apps
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---
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# Get Started with Python and the XRP Ledger
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This tutorial walks you through the basics of building an XRP Ledger-connected application using [xrpl-py](https://github.com/xpring-eng/xrpl-py), a [Python](https://www.python.org) library that makes it easy to integrate XRP Ledger functionality into your apps.
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## Learning Goals
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In this tutorial, you'll learn:
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* How to set up your environment for Python development.
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* The basic building blocks of XRP Ledger-based applications.
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* How to generate keys.
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* How to connect to the XRP Ledger.
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* How to submit a transaction, including preparing and signing it.
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* How to put these steps together to create a simple app that submits a transaction to the XRP Ledger Testnet.
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## Environment Setup
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Complete the steps in the following sections to prepare your environment for development.
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Here are the pre-requisites for `xrpl-py`:
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* [Python 3.7](https://www.python.org/downloads/) or later
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* [`pyenv`](https://github.com/pyenv/pyenv)
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* [`poetry`](https://python-poetry.org/docs/)
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* [`pre-commit`](https://pre-commit.com/)
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### Install the library
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You can get `xrpl-py` through these methods:
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* Clone the repo:
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git clone git@github.com:xpring-eng/xrpl-py.git
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* Install with `pip`:
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pip3 install xrpl-py
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* Download from [Python Package Index (PyPI)](https://pypi.org/)
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### Set up Python environment
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To make it easy to manage your Python environment with `xrpl-py`, including switching between versions, install `pyenv` and follow these steps:
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* Install [`pyenv`](https://github.com/pyenv/pyenv):
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brew install pyenv
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For other installation options, see the [`pyenv` README](https://github.com/pyenv/pyenv#installation).
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* Use `pyenv` to install the optimized version for `xrpl-py` (currently 3.9.1):
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pyenv install 3.9.1
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* Set the [global](https://github.com/pyenv/pyenv/blob/master/COMMANDS.md#pyenv-global) version of Python with `pyenv`:
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pyenv global 3.9.1
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### Set up shell environment
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To enable autcompletion and other functionality from your shell, add `pyenv` to your environment.
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These steps assume that you're using a [Zsh](http://zsh.sourceforge.net/) shell. For other shells, see the [`pyenv` README](https://github.com/pyenv/pyenv#basic-github-checkout).
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* Add `pyenv init` to your Zsh shell:
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echo -e 'if command -v pyenv 1>/dev/null 2>&1; then\n eval "$(pyenv init -)"\nfi' >> ~/.zshrc
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* Source or restart your terminal:
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. ~/.zshrc
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### Manage dependencies and virutal environment
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To simplify managing library dependencies and the virtual environment, `xrpl-py` uses [`poetry`](https://python-poetry.org/docs).
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* [Install `poetry`](https://python-poetry.org/docs/#osx-linux-bashonwindows-install-instructions):
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curl -sSL https://raw.githubusercontent.com/python-poetry/poetry/master/get-poetry.py | python -
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poetry install
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### Set up `pre-commit` hooks
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To run linting and other checks, `xrpl-py` uses [`pre-commit`](https://pre-commit.com/).
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**Note:** You only need to install `pre-commit` if you want to contribute code to `xrpl-py` or generate the reference documentation locally.
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* Install `pre-commit`:
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pip3 install pre-commit
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pre-commit install
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### Generate reference docs
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You can see the SDK reference docs at <<<TODO: add location>>>. You can also generate them locally using `poetry` and `sphinx`:
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```bash
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# Go to the docs/ folder
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cd docs/
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# Build the docs
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poetry run sphinx-apidoc -o source/ ../xrpl
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poetry run make html
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```
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To see the output:
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```bash
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# Go to docs/_build/html/
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cd docs/_build/html/
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# Open the index file to view it in a browser:
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open docs/_build/html/index.html
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```
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## Start building
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When you're working with the XRP Ledger, there are a few things you'll need to manage with your app or integration, whether you're adding XRP into your [wallet](xref: wallets.md), integrating with the [decentralized exchange](xref: decentralized-exchange.md), or [issuing and managing tokens](xref:issued-currencies.md). This tutorial walks you through the patterns common to all of these use cases and provides sample code for implementing them.
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Here are the basic steps you'll need to cover for almost any XRP Ledger project:
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1. [Generate keys.](#generate-keys)
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2. [Connect to the XRP Ledger.](#connect)
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3. [Query the XRP Ledger.](#query)
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4. [Submit a transaction.](#submit-transaction)
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5. [Verify results.](#verify-results)
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### Generate keys
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You need [keys](https://xrpl.org/cryptographic-keys.html) to sign transactions that you submit to the XRP Ledger.
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For testing and development purposes, you can get keys (and XRP balances) from [XRP Faucets](https://xrpl.org/xrp-testnet-faucet.html).
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Otherwise, you should take care to store your keys and set up a [secure signing method](https://xrpl.org/set-up-secure-signing.html).
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<!-- MULTICODE_BLOCK_START -->
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*Python (xrpl-py)*
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```py
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seed = keypairs.generate_seed()
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public, private = keypairs.derive_keypair(seed)
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```
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<!-- MULTICODE_BLOCK_END -->
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### Connect
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To make queries that you can use in your app and submit transactions, you need to establish a connection to the XRP Ledger. There are a few ways to do this. The following sections describe each option in more detail.
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**Warning:** Never use publicly available servers to sign transactions. For more information about security and signing, see [](xref: set-up-secure-signing.md).
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If you only want to explore the XRP Ledger, you can use the [Ledger Explorer](https://livenet.xrpl.org/) to see the Ledger progress in real-time and dig into specific accounts or transactions.
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<!-- MULTICODE_BLOCK_START -->
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*Python (xrpl-py)*
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```py
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client = JsonRpcClient(http://s1.ripple.com:51234/)
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```
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<!-- MULTICODE_BLOCK_END -->
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### Query
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Before you submit a transaction to the XRP Ledger, you should query it to check your account status and balances to make sure that the transaction will succeed.
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<!-- MULTICODE_BLOCK_START -->
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*Python (xrpl-py)*
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```py
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account_info = RequestMethod.ACCOUNT_INFO(rPT1Sjq2YGrBMTttX4GZHjKu9dyfzbpAYe)
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```
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<!-- MULTICODE_BLOCK_END -->
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### Submit transaction
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When you're ready to submit a transaction, follow the steps below.
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#### Prepare transaction
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```python
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tx = Transaction(
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account=_ACCOUNT,
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fee=_FEE,
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sequence=_SEQUENCE,
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transaction_type=TransactionType.ACCOUNT_SET
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)
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```
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#### Sign transaction
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### Verify results |