GMI Automation & Scripting 3 — Questions and Answers
Question 1: In a prepress automation pipeline, which method is preferred for passing job parameters between scripts to maintain traceability?
- Hardcoding values directly in each script
- Using structured job ticket files such as JDF or XML (Correct answer)
- Storing parameters in temporary environment variables only
- Passing parameters through console prompts
Correct answer: Using structured job ticket files such as JDF or XML
Structured job ticket files like JDF or XML provide a documented, auditable record of all job parameters passed between scripts.
Question 2: Which Python library is most commonly used to automate PDF inspection tasks in a GMI scripting environment?
- NumPy
- PyPDF2 or pikepdf (Correct answer)
- Matplotlib
- Requests
Correct answer: PyPDF2 or pikepdf
PyPDF2 and pikepdf are purpose-built Python libraries for reading, inspecting, and manipulating PDF files.
Question 3: A GMI script processes 500 files sequentially and takes 10 minutes. To reduce runtime, the best architectural change is:
- Increase monitor resolution
- Refactor the script to process files in parallel using worker threads or multiprocessing (Correct answer)
- Switch from Python to JavaScript
- Add more conditional checks per file
Correct answer: Refactor the script to process files in parallel using worker threads or multiprocessing
Parallelizing file processing across multiple worker threads or processes leverages available CPU cores to reduce total runtime.
Question 4: In automation scripting, what does 'idempotency' mean in the context of GMI job reprocessing?
- The script runs faster on the second execution
- Running the script multiple times on the same input produces the same result without side effects (Correct answer)
- The script automatically backs up files before processing
- The script requires admin privileges each time
Correct answer: Running the script multiple times on the same input produces the same result without side effects
An idempotent script safely re-executes on the same input without duplicating outputs or corrupting data.
Question 5: When a GMI automation script needs to log processing results for later auditing, which logging level should be used for successful file completions?
- CRITICAL
- ERROR
- INFO (Correct answer)
- DEBUG
Correct answer: INFO
INFO level is the standard logging level for recording normal, successful operational events.
Question 6: Which file format is the standard for exchanging job definitions and workflow instructions between GMI-compatible automation systems?
- CSV
- JDF (Job Definition Format) (Correct answer)
- MP3
- SVG
Correct answer: JDF (Job Definition Format)
JDF (Job Definition Format) is the ISO-standard XML-based format for describing print job parameters and workflow instructions.
Question 7: A automation script must exit with a non-zero exit code when a preflight check fails. Why is this important in a CI/CD-style pipeline?
- It speeds up the rendering engine
- Downstream pipeline steps check the exit code to determine whether to continue or halt (Correct answer)
- It compresses the output file automatically
- It sends an email to the client
Correct answer: Downstream pipeline steps check the exit code to determine whether to continue or halt
Non-zero exit codes signal failure to the orchestrating system, enabling conditional branching or automatic halting of dependent steps.
GMI Automation & Scripting 3
In a prepress automation pipeline, which method is preferred for passing job parameters between scripts to maintain traceability?