PyTeal: Algorand Smart Contracts in Python

PyTeal is a Python language binding for Algorand Smart Contracts (ASC1s).

Algorand Smart Contracts are implemented using a new language that is stack-based, called Transaction Execution Approval Language (TEAL).

However, TEAL is essentially an assembly language. With PyTeal, developers can express smart contract logic purely using Python. PyTeal provides high level, functional programming style abstractions over TEAL and does type checking at construction time.

Install

PyTeal requires Python version >= 3.10.

If your operating system (OS) Python version < 3.10, we recommend:

• Rather than override the OS Python version, install Python >= 3.10 alongside the OS Python version.
• Use pyenv or similar tooling to manage multiple Python versions.

Recommended: Install from PyPi

Install the latest official release from PyPi:

• pip install pyteal

Install Latest Commit

If needed, it's possible to install directly from the latest commit on master to use unreleased features:

WARNING: Unreleased code is experimental and may not be backwards compatible or function properly. Use extreme caution when installing PyTeal this way.

• pip install git+https://github.com/algorand/pyteal

Documentation

• PyTeal Docs
• docs/ (README) contains raw docs.

Development Setup

Setup venv (one time):

• python3 -m venv venv

Active venv:

• . venv/bin/activate (if your shell is bash/zsh)
• . venv/bin/activate.fish (if your shell is fish)

Pip install PyTeal in editable state with dependencies:

• make setup-development
• OR if you don't have make installed:
  • pip install -e . && pip install -r requirements.txt

Format code:

• black .

Lint using flake8:

• flake8 docs examples pyteal scripts tests *.py

Type checking using mypy:

• mypy pyteal scripts

Run unit tests:

• pytest pyteal tests/unit

Run integration tests (assumes a developer-mode algod is available on port 4001):

• pytest tests/integration

Stand up developer-mode algod on ports 4001, 4002 and tealdbg on port 9392 (assumes Docker is available on your system):

• docker-compose up -d

Tear down and clean up resources for the developer-mode algod stood up above:

• docker-compose down