What are some examples of using Pydantic in Python?

Can you give me some examples of how to use Pydantic in Python?

Sure! Pydantic is a data validation and settings management library for Python. Here’s a simple example:

from pydantic import BaseModel

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

user = User(id=1, name='John Doe', email='[email protected]')
print(user)

What happens if I provide invalid data?

If you provide invalid data, Pydantic will raise a ValidationError. For example:

user = User(id='not-an-int', name='John Doe', email='[email protected]')

This will raise an error because 'not-an-int' cannot be converted to an integer.

Can I use Pydantic for nested models?

Yes, you can! Here’s an example of a nested model:

class Address(BaseModel):
    city: str
    state: str

class User(BaseModel):
    id: int
    name: str
    address: Address

user = User(id=1, name='John Doe', address={'city': 'New York', 'state': 'NY'})