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This tool is in beta, use at your own risk



Moccasin

A fast, pythonic, Vyper smart contract testing and development framework.

uv moccasin license python-versions

The smaller bar is better, it means it's faster

Shows a bar chart with benchmark results.

You can see how we conducted these tests from the benchmarking repo.

Fast to install, test, and run python commands on your smart contracts.

Highlights

  • 🐍 Pythonic start to finish, built on top of Vyper's titanoboa
  • 🔐 ZKsync built-in support
  • 📑 Named Contracts allow you to define smart contract addresses without scaffolding anything yourself
  • 🧪 Custom staging pytest markers so you can run tests anywhere, anyhow
  • 🦊 Support for encrypting wallets, no private keys in .env files!
  • 🧳 GitHub and Python smart contract dependency installation

Quickstart

Head over to the moccasin installation documentation to for other install methodologies and getting stated.

This README Quickstart

To install the moccasin mox command, we recommend the uv tool.

uv tool install moccasin --prerelease=allow

Then, see a list of commands with:

mox --help

Documentation

You can view the documentation here.

Contributing

If you're interested in helping build moccasin, please see the contributing guide.

Help output

mox --help
usage: Moccasin CLI [-h] [-d] [-q]
                    {init,compile,build,test,run,script,deploy,wallet,console,install,purge,config,explorer,inspect,deployments,utils,u,util}
                    ...

🐍 Pythonic Smart Contract Development Framework

positional arguments:
  {init,compile,build,test,run,script,deploy,wallet,console,install,purge,config,explorer,inspect,deployments,utils,u,util}
    init                Initialize a new project.
    compile (build)     Compiles the project.
    test                Runs all tests in the project.
    run (script)        Runs a script with the project's context.
    deploy              Deploys a contract named in the config with a deploy script.
    wallet              Wallet management utilities.
    console             BETA, USE AT YOUR OWN RISK: Interact with the network in a python shell.
    install             Installs the project's dependencies.
    purge               Purge a given dependency
    config              View the Moccasin configuration.
    explorer            Work with block explorers to get data.
    inspect             Inspect compiler data of a contract.
    deployments         View deployments of the project from your DB.
    utils (u, util)     Helpful utilities - right now it's just the one.

options:
  -h, --help            show this help message and exit
  -d, --debug           Run in debug mode
  -q, --quiet           Suppress all output except errors

Acknowledgements

Background

Agkistrodon piscivorus is a species of venomous snake, a pit viper in the subfamily Crotalinae of the family Viperidae. The generic name is derived from the Greek words ἄγκιστρον agkistron "fish-hook, hook" and ὀδών odon "tooth", and the specific name comes from the Latin piscis 'fish' and voro '(I) eat greedily, devour'; thus, the scientific name translates to "hook-toothed fish-eater". Common names include cottonmouth, northern cottonmouth, water moccasin, swamp moccasin, black moccasin, and simply viper.

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License

moccasin is licensed under either of:

at your option.

Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in moccasin by you, as defined in the Apache-2.0 license, shall be dually licensed as above, without any additional terms or conditions.