[](https://hamel.dev/blog/posts/prompt/#cb4-1)from pydantic import BaseModel, Field
[](https://hamel.dev/blog/posts/prompt/#cb4-2)from guardrails import Guard
[](https://hamel.dev/blog/posts/prompt/#cb4-3)import openai
[](https://hamel.dev/blog/posts/prompt/#cb4-4)
[](https://hamel.dev/blog/posts/prompt/#cb4-5)class Pet(BaseModel):
[](https://hamel.dev/blog/posts/prompt/#cb4-6)    pet_type: str = Field(description="Species of pet")
[](https://hamel.dev/blog/posts/prompt/#cb4-7)    name: str = Field(description="a unique pet name")
[](https://hamel.dev/blog/posts/prompt/#cb4-8)
[](https://hamel.dev/blog/posts/prompt/#cb4-9)prompt = """
[](https://hamel.dev/blog/posts/prompt/#cb4-10)    What kind of pet should I get and what should I name it?
[](https://hamel.dev/blog/posts/prompt/#cb4-11)
[](https://hamel.dev/blog/posts/prompt/#cb4-12)    ${gr.complete_json_suffix_v2}
[](https://hamel.dev/blog/posts/prompt/#cb4-13)"""
[](https://hamel.dev/blog/posts/prompt/#cb4-14)guard = Guard.from_pydantic(output_class=Pet, prompt=prompt)
[](https://hamel.dev/blog/posts/prompt/#cb4-15)
[](https://hamel.dev/blog/posts/prompt/#cb4-16)validated_output, *rest = guard(
[](https://hamel.dev/blog/posts/prompt/#cb4-17)    llm_api=openai.completions.create,
[](https://hamel.dev/blog/posts/prompt/#cb4-18)    engine="gpt-3.5-turbo-instruct"
[](https://hamel.dev/blog/posts/prompt/#cb4-19))
[](https://hamel.dev/blog/posts/prompt/#cb4-20)
[](https://hamel.dev/blog/posts/prompt/#cb4-21)print(f"{validated_output}")