TypeError: conlist() got an unexpected keyword argument 'min_items'

I am using pydantic and strictyaml to read a yaml config file. I am using this class

class CarData(BaseModel):
    model: str
    length: float
    width: float
    height: float
    fuel_efficiency: conlist(item_type=float, min_items=3, max_items=3)  # Ensures exactly 3 values
    # fuel_efficiency: list[float]

and I am following what is written in the documentation of conlist, however when I run the script I got

TypeError: conlist() got an unexpected keyword argument 'min_items'

Why is this happening, and how can it be corrected? (My pydantic version is 2.9.2 just in case)

The error is because of you are using the latest version of Pydantic v2.9 but using the old version parameters for conlist. In the Pydantic version 2.x those parameters have changed to min_lenght and max_length according to the latest documentation. However, your link is related to the version 1.10.

Therefore, this issue will be fixed by the following line:

fuel_efficiency: conlist(float, min_length=3, max_length=3)

It's worth mentioning that, you can also have this by Annotated as follows:

from typing import Annotated
from pydantic import Field    

fuel_efficiency: Annotated[list[float], Field(min_length=3, max_length=3)]

Or:

fuel_efficiency: list[float] = Field(min_length=3, max_length=3)