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title Install Python custom runtime
description Learn how to install a Python custom runtime for SQL Server using Language Extensions. The Python custom runtime can run machine learning scripts.
ms.prod sql
ms.technology machine-learning-services
ms.date 02/08/2021
ms.topic how-to
author dphansen
ms.author davidph
ms.custom seo-lt-2019
zone_pivot_groups sqlml-platforms
monikerRange >=sql-server-ver15||>=sql-server-linux-ver15

Install a Python custom runtime for SQL Server

[!INCLUDE SQL Server 2019 and later]

Learn how to install a Python custom runtime for running external Python scripts with SQL Server on:

  • Windows
  • Ubuntu Linux
  • Red Hat Enterprise Linux (RHEL)
  • SUSE Linux Enterprise Server (SLES)

The custom runtime can run machine learning scripts and uses the SQL Server Language Extensions.

Use your own version of the Python runtime with SQL Server, instead of the default runtime version installed with SQL Server Machine Learning Services.

::: zone pivot="platform-windows" [!INCLUDE Python custom runtime - Windows] ::: zone-end

::: zone pivot="platform-linux-ubuntu" [!INCLUDE Python custom runtime - Linux - Prerequisites]

[!INCLUDE Python custom runtime - Linux - Ubuntu specific steps]

[!INCLUDE Python custom runtime on Linux - Common steps] ::: zone-end

::: zone pivot="platform-linux-rhel" [!INCLUDE Python custom runtime - Linux - Prerequisites]

[!INCLUDE Python custom runtime - Linux - RHEL specific steps]

[!INCLUDE Python custom runtime on Linux - Common steps] ::: zone-end

::: zone pivot="platform-linux-sles" [!INCLUDE Python custom runtime - Linux - Prerequisites]

[!INCLUDE Python custom runtime - Linux - SLES specific steps]

[!INCLUDE Python custom runtime on Linux - Common steps] ::: zone-end

Enable external script

You can execute a Python external script with the stored procedure sp_execute_external script.

To enable external scripts, use Azure Data Studio to execute the statement below.

sp_configure 'external scripts enabled', 1;
RECONFIGURE WITH OVERRIDE;

Verify installation

Use the following SQL script to verify the installation and functionality of the Python custom runtime.

EXEC sp_execute_external_script
@language =N'myPython',
@script=N'
import sys
print(sys.path)
print(sys.version)
print(sys.executable)'

Next steps