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Learning/Knowledge checks/Scripting for EDA Automation/A Python regression runner/Check

Module checkpoint

A Python regression runner knowledge check

Answer every question from your current understanding. After submission, compare your reasoning with the explanation and revisit any weak concept.

This check covers A Python regression runner. Read it first if you have not.

5 QuestionsOne Answer eachImmediate ScoreDetailed Explanations

Read→Reason→Select→Review

Question 1 of 5Why pass a list such as ['vvp', '-n', sim] to subprocess.run instead of one command string?

Each element is one argument, so no shell quoting or injection problems ariseA list makes the child process run with a higher scheduling priorityA list lets the command use shell features such as pipes and globs

Question 2 of 5What happens when a process run with subprocess.run(..., timeout=120) exceeds the limit?

The child keeps running and the call returns status zeroThe child is paused until the user presses a key to continueThe child is killed and subprocess.TimeoutExpired is raised

Question 3 of 5Why does the runner use check=True for compilation but not for simulation?

check=True only works for programs that are written in CA compile must succeed, while a simulation verdict comes from its logCompilers always exit nonzero, while simulators never do so

Question 4 of 5Why are threads acceptable for running simulations in parallel despite Python's GIL?

The threads mostly wait on separate simulator processes doing the workThe GIL is switched off whenever subprocess.run is being calledEach thread starts its own Python interpreter with its own GIL

Question 5 of 5What makes a failing random-seed test reproducible?

Running the same test with many more seeds than beforeDeleting the build folder before the next run startsPassing the seed explicitly and printing the exact rerun command

Review every selection before submitting. You can retry after reading the explanations.

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