AttributeError: 'utils' has no attribute 'collect_vendors' due to absolute import conflict

[koerper]

Bug description

When using PriceCollector.collect(), an AttributeError: module 'utils' has no attribute 'collect_vendors' can occur if the user's project also contains a file named utils.py in the root directory (i.e., the current working directory when running a script or notebook).

This happens because chemprice/chemprice.py (and potentially other internal modules) uses an absolute import import utils. This can cause Python to import the user's utils.py instead of the chemprice package's own chemprice/utils.py file, which contains the collect_vendors function.

To Reproduce

Steps to reproduce the behavior:

1. Create a Python project.
2. Install chemprice.
3. Create a file named utils.py in the root of the project (it can be empty or contain any code).
4. In a script or notebook in the project root, try to use PriceCollector().collect(["CCO"]).
5. See error: AttributeError: module 'utils' has no attribute 'collect_vendors'

Expected behavior

chemprice should always use its internal utils.py module, regardless of whether a utils.py file exists in the user's project directory.

Suggested Solution

Modify the import statement in chemprice/chemprice.py (and any other internal modules that import utils) from:
import utils
to a relative import:
from . import utils

This will ensure that the chemprice package always loads its own utils module.

Environment (example):

• Python version: 3.11
• chemprice version: 1.1.0
• OS: macOS