This example is a simple Python financial calculator app which is instrumented with Logfire. If you spin up the server locally and interact with the calculator app, you'll be able to see traces come in automatically. The Logfire instrumentation is done with just a few lines of code in main.py.

Clone the repository, navigate to it, setup a virtual environment, and install the dependencies:

git clone https://github.com/pydantic/logfire.git
cd examples/python/flask-sqlalchemy
python -m venv venv
source venv/bin/activate
pip install 'logfire[sqlalchemy,flask]' flask-sqlalchemy

If you don't have a Logfire account, create a free one in Logfire. Then authenticate Logfire locally:

logfire auth

Run the main.py file:

python main.py

Now you should see

• Python app running locally at http://127.0.0.1:5000/
• Logfire app running live at https://logfire.pydantic.dev/<my-org>/<my-project>

In order to see traces arrive in the Logfire app, interact with the local calculator app (click around, enter values into the fields, click calculate)