Pydantic Puzzlers

puzzler1.py

import pydantic
    
class Project(pydantic.BaseModel):
    source: str
    validate_: bool = False

    class Config:
        # validate is not a valid field name, because BaseModel has a validate method
        # use alias so we can use a validate field in the json and validate_ in python
        fields = {"validate_": {"alias": "validate"}}

def roundtrip(project_in: Project) -> None:
    """Convert to json and back """
    project_out = Project(**project_in.dict())
    print(f"input: {project_in.validate_}, output: {project_out.validate_}")

projectt = Project(source="test", validate=True)
roundtrip(projectt)

projectf = Project(source="test", validate=False)
roundtrip(projectf)