DamlForge

DamlForge lets you write Canton smart contracts in .vy files. These use Python syntax with a few contract-specific (Vyper-flavored) keywords. The forge compiler turns each .vy file into ordinary Daml source, and DPM, the Daml package manager, builds, tests, and ships that source. Nothing in a .vy file runs as Python: the file is parsed, checked, and lowered straight to Daml.

How it works

1. Install DamlForge (Python 3.11 or newer):

pip install damlforge

2. Write a contract in Main.vy:

from forge.builtins.daml_lang import create
from forge.models import ContractId, Party, choice, template


@template
class Asset:
    issuer: Party
    owner: Party
    name: str

    signatory: Party = issuer
    observer: Party = owner
    ensure: bool = name != ""

    @choice(controller=owner, consuming=True)
    def give(self, new_owner: Party) -> ContractId[Asset]:
        return create(Asset(issuer=self.issuer, owner=new_owner, name=self.name))

3. Compile it to Daml:

forge daml Main.vy -o out/

forge generates out/Main.daml:

module Main where

template Asset
  with
    issuer : Party
    owner : Party
    name : Text
  where
    signatory issuer
    observer owner
    ensure name /= ""

    choice Give : ContractId Asset
      with
        new_owner : Party
      controller owner
      do
        let self = this
        create (Asset with issuer = self.issuer, owner = new_owner, name = self.name)

More: see the full documentation, from setup to packaging.