POC Automation & Scripting 2

Question 1

Which Python module provides the `run()` function for executing shell commands and capturing output?

Accepted Answer

subprocess

Answer

`subprocess.run()` executes a command, waits for it to complete, and returns a CompletedProcess instance with stdout/stderr.

Question 2

In a Python automation script, what does `subprocess.run(['ls', '-la'], capture_output=True, text=True)` return?

Accepted Answer

A CompletedProcess object with stdout and stderr as strings

Answer

`capture_output=True` and `text=True` make `run()` return a CompletedProcess whose `.stdout` and `.stderr` are decoded strings.

Question 3

Which `schedule` library method runs all pending scheduled jobs?

Accepted Answer

schedule.run_pending()

Answer

`schedule.run_pending()` checks all registered jobs and runs any whose next run time has passed.

Question 4

What is the purpose of the `watchdog` library in Python automation?

Accepted Answer

Monitor filesystem events and trigger callbacks

Answer

`watchdog` monitors file system changes (create, modify, delete) and dispatches events to handler classes.

Question 5

Which context manager ensures a file is properly closed even if an exception occurs during reading?

Accepted Answer

`with open(filename) as f:`

Answer

The `with` statement calls `__exit__` on the file object, closing it automatically even if an exception is raised inside the block.

(POC) Python Online Certification Practice Test