> ## Documentation Index
> Fetch the complete documentation index at: https://docs.simli.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Python SDK 2.x.x Upgrade Guide

Not as much changed here on the interface compared to the [Javascript SDK](/api-reference/javascript_upgrade_guide.mdx). However, there are still a few changes you might like to know about!

## 1. Initialize got renamed to start

Not that big of a difference, it's just to unify function names between SDKs. If you're using the `async with` flow, you shouldn't notice any difference

## 2. API Key is now passed to SimliClient directly, not with the config

This matches the new API style. SimliConfig maps directly to the body of [API Endpoint for creating session token.](/api-reference/compose-session-token) So, when we changed where the api key is passed to that endpoint, it changed in the SDK

## 3. Logging

We're now using python default logger instead of writing directly to stdout. This should make handling logs a lot easier. The logger is named `simli_client`.