TypeGen — Python emitter (Pydantic v2)

TypeTarget.Python emits Pydantic v2 BaseModel subclasses — idiomatic for FastAPI backends consuming the same contract as the C# DTOs. Class names stay PascalCase; property names get snake_cased (PEP 8) with Field(alias="…") preserving the C# casing on JSON parse / serialize.

[GenerateTypes(Targets = TypeTarget.Python, OutputDir = "../api_models")]
public class Order
{
    public int Id { get; set; }
    public string Customer { get; set; } = "";
    public OrderStatus Status { get; set; }
    public string? Note { get; set; }
}

order.py

from __future__ import annotations
from pydantic import BaseModel, Field
from order_status import OrderStatus

class Order(BaseModel):
    id: int = Field(alias="Id")
    customer: str = Field(alias="Customer")
    status: OrderStatus = Field(alias="Status")
    note: str | None = Field(default=None, alias="Note")

Switch to plain stdlib dataclasses (no Pydantic dependency) via the configurator: b.Python(py => py.Style = PythonStyle.Dataclass);. Single-file bundle vs file-per-class via py.FileLayout. Disable snake_case conversion with py.SnakeCaseProperties = false.