Python Supported Versions

Cloudera Data Science Workbench supports the following Python versions.

The default Cloudera Data Science Workbench engine includes Python 2.7.11 and Python 3.6.10. CDSW supports what comes bundled with the base image. To use PySpark within the HDP cluster, the Spark executors must have access to a matching version of Python. For many common operating systems, the default system Python will not match the minor release of Python included in Cloudera Data Science Workbench.

To ensure that the Python versions match, Python can either be installed on every HDP host or made available per job run using Spark’s ability to distribute dependencies. Given the size of a typical isolated Python environment and the desire to avoid repeated uploads from gateway hosts, Cloudera recommends installing Python 2.7 and 3.6 on the cluster if you are using PySpark with lambda functions.

You can install Python 2.7 and 3.6 on the cluster using any method and set the corresponding PYSPARK_PYTHON environment variable in your project. Cloudera Data Science Workbench includes a separate environment variable for Python 3 sessions called PYSPARK3_PYTHON. Python 2 sessions continue to use the default PYSPARK_PYTHON variable. This will allow you to run Python 2 and Python 3 sessions in parallel without either variable being overridden by the other.


Anaconda is a package manager that makes it easier to install, distribute, and manage popular Python libraries and their dependencies. You can use Anaconda for package management with Cloudera Data Science Workbench, but it is not required.
You can install Anaconda before you install Cloudera Data Science Workbench or after. Once Anaconda is installed, perform the following steps to configure Cloudera Data Science Workbench to work with Anaconda:
  1. Install the Anaconda package on all cluster hosts. For installation instructions, refer to the Anaconda installation documentation.

  2. Set the ANACONDA_DIR property in the Cloudera Data Science Workbench configuration file: cdsw.conf . This can be done when you first configure cdsw.conf during the installation or later.

  3. Restart Cloudera Data Science Workbench to have this change go into effect.