---
title: "Prohibited Data Block Keywords and Built-ins"
description: "This article covers Python Keywords and Built-ins that are frequently used while coding. For a list of supported (i.e., whitelisted) libraries, see [Python Data Block Libraries & Keywords](https://learn.assette.com/docs/python-libraries-keywords/). ## Prohibited Data Block Keywords and Built-ins The following keywords are prohibited…"
url: "https://learn.assette.com/docs/restricted-keywords-built-in-functions/"
updated: "2024-10-25"
category: Developers / Developer Tools / Tool Setup
---

# Prohibited Data Block Keywords and Built-ins

This article covers Python Keywords and Built-ins that are frequently used while coding. For a list of supported (i.e., whitelisted) libraries, see [Python Data Block Libraries & Keywords](https://learn.assette.com/docs/python-libraries-keywords/).

## Prohibited Data Block Keywords and Built-ins

The following keywords are prohibited within Data Blocks. Using these may have unexpected consequences including non-functionality of the Data Blocks(s)

| Prohibition | Note |
| --- | --- |
| import | Use Configuration Data Block and Data Block dependency instead |
| return | Has no effect as all Data Block output is in JSON. Use "response" instead |