From Rose version 2.2.0 onwards, the standard PYTHONPATH environment variable is ignored by design to avoid conflicts between Rose’s internal Python environment and user-defined environments. To include custom Python modules in your Rose workflows, you must instead use the ROSE_PYTHONPATH environment variable.

When running Rose tasks under Cylc 8, this variable should be explicitly set in your suite.rc file using the pre-script directive for the appropriate task.

Example Cylc7 suite running in the compatible mode of Cylc8 
[scheduling]
   [[dependencies]]
      graph = "rose_ana_test"

[runtime]
    [[root]]
        env-script = "eval $(rose task-env)"
      [[[remote]]]
        host = localhost
      [[[job]]]
          batch system = background

    [[rose_ana_test]]
        pre-script = "export ROSE_PYTHONPATH=$PYTHON_MODULE_PATH"
        script = "rose task-run --verbose"

This configuration ensures that the specified path ($PYTHON_MODULE_PATH) is correctly included for Python module resolution during Rose ana task execution.

For more information, see: Rose PYTHONPATH change – Discourse thread


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