pydantic BaseModel not found in Fastapi

Question

I have python3 3.6.9 on Kubuntu 18.04. I have installed fastapi using pip3 install fastapi. I'm trying to test drive the framework through its official documentation and I'm in the relational database section of its guide.

In schemas.py:

from typing import List

from pydantic import BaseModel

class VerseBase(BaseModel):
    AyahText: str
    NormalText: str

class Verse(VerseBase):
    id: int

    class Config:
        orm_mode = True

VS code highlights an error in from pydantic import BaseModel and it tells that: No name 'BaseModel' in module 'pydantic'. Additionally, when I try to run uvicorn main:app reload I have gotten the following error:

File "./main.py", line 6, in <module>
   from . import crud, models, schemas
ImportError: attempted relative import with no known parent package

I have tried to renstall pydantic using pip3 but it tells me that:

Requirement already satisfied: dataclasses>=0.6; python_version < "3.7" in ./.local/lib/python3.6/site-packages (from pydantic) (0.7)

Answer 1

This is a common problem with binary/C extensions. For further details, check here: (Pylint & C extensions)

To fix it, you need to add the following to .pylintrc file (You can add this file to your current project folder if you like)

[MASTER]
extension-pkg-allow-list=pydantic

Note that switching to mypy (as suggested by another answer here) is not the right approach since pylint & mypy are two different things (the former is a linter while the latter is sort of a type checker)

Answer 2

The first thing that you noticed

pydantic BaseModel not found in Fastapi

is related to your linter. I got the same warning when my linter was pylint, so I changed the linter from pylint to mypy and the problem disappeared.

1. Install mypy via pip

   pip install mypy

2. Open the command palette in VScode

   Ctrl+Shift+P

3. Type this in command palett:

   Python: Select Linter

4. Then Select mypy in the list of linters