You’re running into a common issue in Python type checking, especially when using tools like mypy or similar static analyzers. The error:

Skipping analyzing “yfinance”: module is installed, but missing library stubs or py.typed marker

1. Missing Type Hints: Some third-party libraries, like yfinance, don’t include type hints or .pyi stub files, making type checkers unsure about their types.
2. Missing py.typed Marker: If a package doesn’t include a py.typed file, tools like mypy assume it’s untyped and skip checking it.
3. Module Not Found Issues: If you’re getting additional ModuleNotFoundError, it could be due to missing installations or incorrect Python environments.

Try these ways to see if it's fixed or not

1. Ignore the Warning in mypy

Since yfinance doesn’t provide type hints, you can tell mypy to ignore it by adding this in your code:

python

from typing import Any

import yfinance # type: ignore

data: Any = yfinance.download("AAPL")

Or, globally ignore the warning in mypy.ini:

ini

[mypy]

ignore_missing_imports = True

2. Install types- Stub Packages

Some libraries have third-party stubs available. Try installing:

sh

pip install types-requests types-pytz

If yfinance had a stub package (it currently doesn’t), it would be named types-yfinance.

3. Use a Virtual Environment

Ensure your environment is set up correctly:

sh

python -m venv venv

venv\Scripts\activate # On Windows

source venv/bin/activate # On MacOS

pip install yfinance mypy

4. Use py.typed Trick (For Your Own Libraries)

If you’re working on your own package and want it to be recognized as typed, create an empty py.typed file inside your module’s directory:

sh

touch mymodule/py.typed

• This warning doesn’t break your code; it only affects type
  checking.
• You can ignore it safely or provide Any hints.
• If you use mypy, adding ignore_missing_imports = True is usually the
  simplest fix.