How do I define a schema in Python?

How do I define a schema in Python?

You can define a schema in Python using libraries like Pydantic or Marshmallow. Which one are you interested in?

I want to use Pydantic. Can you show me an example?

Sure! Here's a simple example:

from pydantic import BaseModel

class User(BaseModel):
    id: int
    name: str
    email: str

This defines a User schema with three fields.

What if I want to add validation to the fields?

You can add validation by using Pydantic's built-in validators. For example:

class User(BaseModel):
    id: int
    name: str
    email: str

    @validator('email')
    def email_must_be_valid(cls, v):
        if '@' not in v:
            raise ValueError('Invalid email')
        return v