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

Answer 3

Tested on vscode:

In your workspace folder, specify Options in

pylintrc

or

.pylintrc

options file, as specified in Pylint command line argument, using this command: pylint --generate-rcfile > .pylintrc

Look for extension-pkg-allow-list and add pydantic after = It should be like this after generating the options file: extension-pkg-allow-list=

When you add pydantic, it should be like this:

extension-pkg-allow-list=pydantic

This should solve your problem.

Answer 4

The problem of highlighting in VS code may be a problem due to the fact that you did not open the folder. It's quite annoying as it happens often to me as well (and I have basically your same config).

Regarding the second problem you mention, it is probably due to the fact that the folder in which the script lays, does not have a __init__.py file. If you add it, it should work since python will interpret the folder as a module.

As an alternative, you could try to import with the full path from the top folder (e.g. from app.module.main import app).

For more information about modules see the following links:

Python 3.8 Modules

Real Python

• SaidbakR: I have noticed something, when importing it from the project's root, the import works as regarded in the tutorial, but if I have tried to run it from the myprojectRoot/db, I have to modify the import statements
• lsabi: Without the folder structure it's not easy for me to provide an answer, but that's how python imports work (or at least I understand for your project structure)

Answer 5

Building on the excellent answers that explain how to modify .pylintrc, if you are using pyproject.toml for your project you can do this instead:

[tool.pylint.main]
extension-pkg-allow-list = ["pydantic"]

• avimimoun: And in .pylintrc, you can use extension-pkg-allow-list=pydantic, see documentation

Answer 6

My linter was Pylint. Disabling pylint was worked for me. I also have Pylance but it didn't give me the same error