from typing import List
import json
from pydantic import BaseModel
from pydantic.schema import schema

class Pets(BaseModel):
    __root__: List[str]

print(Pets(__root__=['dog', 'cat']))
# > Pets __root__=['dog', 'cat']

print(Pets.parse_obj(__root__=['dog', 'cat']))
# > Pets __root__=['dog', 'cat']

print(Pets.schema())
# > {'title': 'Pets', 'type': 'array', 'items': {'type': 'string'}}

pets_schema = schema([Pets])
print(json.dumps(pets_schema, indent=2))

# {
#  "definitions": {
#    "Pets": {
#      "title": "Pets",
#      "type": "array",
#      ...