Module showing as missing in PyCharm despite installation

An environment is set up using Poetry v2.1.3. The environment is created from a pyproject.toml which has pandas as one of the dependencies:

[project]
name = "pintail-proj"
version = "0.1.0"
description = ""
readme = "README.md"
requires-python = ">=3.12, <4.0"
dependencies = [
    "poetry-core (>=2.0.0,<3.0.0)",
    "pandas (>= 2.3.0)"
]

[tool.poetry]
packages = [{include = "poetry_demo", from = "src"}]


[build-system]
requires = ["poetry-core>=2.0.0,<3.0.0"]
build-backend = "poetry.core.masonry.api"

The environment is successfully created using poetry update from the directory containing the file. Opening PyCharm (PyCharm Community v2025.1.2), the interpreter is set to the Poetry environment. All packages are installed as expected, including pandas, which will be called:

However, when attempting to call the pandas package from a script, an error is returned:

No module named 'pandas' 

What is the error in the setup of this environment?

I think that you're using the wrong interpreter. Even though pandas is installed via Poetry, PyCharm may not be pointing to the Poetry-created virtual environment.

So try to:

• Run poetry env info --path to get the venv path.
• In PyCharm → Settings → Project → Python Interpreter → Add Interpreter → Existing environment.
• Select the Python executable inside that path (e.g., ..../bin/python).
• Ensure src/ is marked as a "Sources Root" if your code is in src/poetry_demo/.