hi everyone, how do you properly type this go struct in python?

type Team struct {
  Name         string `yaml:"name"`
  Description  string `yaml:"description"`
  Slug         string   `yaml:"slug"`
  ParentTeamId int
  Teams        []Team   `yaml:"teams"`
}

here is what i have:

@dataclass
class Team:
    name: str
    slug: str
    description: str
    ...
    subteams: Optional[list[Team]] 
    parent_team_id: Optional[int] = None

the team data is read from a yaml file here are several issues: 1. in order to use

.

refence , you have to do

Team(**team)

to create the object, where

team

is a python dict read from YAML. however, this will be flagged by type checker:

Arguments missing for parameters "name", "slug", "description

2. there is a nested field

subteams

, when reading from yaml, it's not automatically deserialized, so you have to create the object again

Team(**sub_team)

to use

.

reference 3. since not every team entry has

subteam

field, you have to assign empty list as default value. but when you iterate over the entries in yaml, you will have type error

Object of type "None" cannot be used as iterable value

when you do

parent_team.subteams

I think you might be interested in pydantic (https://pydantic-docs.helpmanual.io)

Just curious. From OP post there is nothing about Pulumi itself and even Python code does not look like resources in Pulumi. Why the question is here?

hah, you’re right 😄

thanks very much!

pydantic

solved my problem nicely!!👍

@bored-monitor-99026 technically, you can assign empty list to a dataclass field, it’s just not that straightforward (because it’s mutable as you said):

@dataclass
class Team:
    subteams: List["Team"] = field(default_factory=lambda: [])
    ...

hi friends - just got back from holiday and I'm so glad you all found something that works! 🎉