"    Input:  {
                data_uoa            - data UOA of the script-containing entry
                (script_module_uoa) - module UOA of the script-containing entry ('script' by default)
                (prewrapper_lines)  - lines of the environment-setting pre-wrapper
                (script_module_uoa) - module UOA of the script entry
                (keep_tmp_files)    - "yes" will keep them, deleted otherwise

                (code)              - Python script name (without .py)
                (func)              - Python function name in this script
                (dict)              - dict to pass to script
                (output_json_file)  - filename to save the output dictionary into

            }

    Output: {
                return              - return code =  0, if successful
                                                  >  0, if error
                (error)             - error text if return > 0

                (return_code)       - script's return code
            }
    Test:
            ck _run_external script:debug @@@"{'prewrapper_lines': ['export CK_PYTHON=python3'], 'dict': {'alpha': 777}}"

"