Handle missing python-dotenv dependency in env loader

[ereezyy]

Summary

• allow the environment loader to work when python-dotenv is not installed
• log a clear message when skipping .env loading due to the optional dependency being absent

Testing

• python - <<'PY' from AgentSystem.utils.env_loader import env; print('env loader path:', env.env_path) ; PY

---

https://chatgpt.com/codex/tasks/task_e_69051b63fd3483299f814f6f07012263

Summary by Sourcery

Enhancements:

• Gracefully handle missing python-dotenv dependency by providing a fallback import and skipping .env loading with an informative log message

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

This PR makes the python-dotenv dependency optional by wrapping its import in a try/except and adds a runtime check in the environment loader to skip and log loading when the dependency is missing.

Class diagram for updated env loader dependency handling

classDiagram
    class EnvLoader {
        -env_path: Path
        +_load_env_file(): None
    }
    EnvLoader : +_load_env_file() checks for python-dotenv
    EnvLoader : +_load_env_file() logs info if python-dotenv missing
    EnvLoader : +_load_env_file() loads .env if python-dotenv present

Loading

File-Level Changes

Change	Details	Files
Make python-dotenv import optional	Wrap import of load_dotenv in a try/except block Assign load_dotenv to None on ModuleNotFoundError	AgentSystem/utils/env_loader.py
Skip .env loading when python-dotenv is absent	Add a check for load_dotenv being None in _load_env_file Log an info message and return early if the dependency is missing	AgentSystem/utils/env_loader.py

---

Tips and commands

Interacting with Sourcery

• Trigger a new review: Comment @sourcery-ai review on the pull request.
• Continue discussions: Reply directly to Sourcery's review comments.
• Generate a GitHub issue from a review comment: Ask Sourcery to create an
  issue from a review comment by replying to it. You can also reply to a
  review comment with @sourcery-ai issue to create an issue from it.
• Generate a pull request title: Write @sourcery-ai anywhere in the pull
  request title to generate a title at any time. You can also comment
  @sourcery-ai title on the pull request to (re-)generate the title at any time.
• Generate a pull request summary: Write @sourcery-ai summary anywhere in
  the pull request body to generate a PR summary at any time exactly where you
  want it. You can also comment @sourcery-ai summary on the pull request to
  (re-)generate the summary at any time.
• Generate reviewer's guide: Comment @sourcery-ai guide on the pull
  request to (re-)generate the reviewer's guide at any time.
• Resolve all Sourcery comments: Comment @sourcery-ai resolve on the
  pull request to resolve all Sourcery comments. Useful if you've already
  addressed all the comments and don't want to see them anymore.
• Dismiss all Sourcery reviews: Comment @sourcery-ai dismiss on the pull
  request to dismiss all existing Sourcery reviews. Especially useful if you
  want to start fresh with a new review - don't forget to comment
  @sourcery-ai review to trigger a new review!

Customizing Your Experience

Access your dashboard to:

• Enable or disable review features such as the Sourcery-generated pull request
  summary, the reviewer's guide, and others.
• Change the review language.
• Add, remove or edit custom review instructions.
• Adjust other review settings.

Getting Help

• Contact our support team for questions or feedback.
• Visit our documentation for detailed guides and information.
• Keep in touch with the Sourcery team by following us on X/Twitter, LinkedIn or GitHub.