This is an implementation of PEP 557, Data Classes.
See https://www.python.org/dev/peps/pep-0557/ for the details.
A test file can be found at https://github.com/ericvsmith/dataclasses/blob/master/tst.py, or in the sdist file.
Example:
from dataclasses import dataclass, field
@dataclass
class InventoryItem:
name: str
unit_price: float
quantity_on_hand: int = 0
def total_cost(self) -> float:
return self.unit_price * self.quantity_on_hand
item = InventoryItem('hammers', 10.49, 12)
print(item.total_cost())
Some additional tools can in dataclass_tools.py, included in the sdist.