This guide demonstrates how to use TrueFoundry OtelCollector along with the Traceloop SDK to instrument Python code. In this example, we’ll show how to instrument a simple Python application with nested function calls using Traceloop’s task decorators.

1

Create Tracing Project, API Key and copy tracing code

Follow the instructions in Getting Started to create a tracing project, generate API key and copy the tracing code.

2

Install Dependencies

First, you need to install the following

pip install traceloop-sdk dotenv
3

Add Tracing code to Python application

For Python applications, we need to add the Traceloop.init() call to the application and use the @task decorator to trace functions.

Python Code
from dotenv import load_dotenv
import os

# importing traceloop sdk and decorators
from traceloop.sdk import Traceloop
from traceloop.sdk.decorators import task

load_dotenv()

# Add the traceloop init code to your application
TFY_API_KEY = os.environ.get("TFY_API_KEY")
Traceloop.init(
    api_endpoint="<enter_your_api_endpoint>",
    headers = {
        "Authorization": f"Bearer {TFY_API_KEY}",
        "TFY-Tracing-Project": "<enter_your_tracing_project_fqn>",
    },
)

# Child function — will create its own span
@task(name="greet_user_task")
def greet_user(name):
    print(f"Hello, {name}!")

# Parent function — also creates a span and calls the child
@task(name="main_task")
def main():
    user_name = "Sateesh"
    greet_user(user_name)
    print("Main task finished.")

# Run the main function
main()
4

Run your application and view logged trace