POC Troubleshooting & Problem Resolution 3

Question 1

A `FileNotFoundError` is raised when opening a file. Which debugging step should you take first?

Accepted Answer

Print or log the exact file path being used at runtime

Answer

Runtime paths often differ from what developers assume; printing the resolved path immediately reveals mismatches.

Question 2

You catch an exception with `except Exception as e:` but lose the original traceback. How do you re-raise it with the full traceback intact?

Accepted Answer

Use `raise` with no arguments inside the except block

Answer

A bare `raise` inside an except block re-raises the current exception preserving its original traceback.

Question 3

Your unit test passes locally but fails in CI because a file path uses backslashes. What is the portable fix?

Accepted Answer

Use os.path.join() or pathlib.Path() to construct paths

Answer

`os.path.join()` and `pathlib.Path` use the correct separator for the current OS, making paths platform-independent.

Question 4

A `UnicodeDecodeError` occurs when reading a file. Which argument to `open()` most likely fixes it?

Accepted Answer

encoding='utf-8'

Answer

Specifying the correct encoding (commonly UTF-8) tells Python how to decode the raw bytes in the file.

Question 5

You have an infinite loop in a running Python script. Which is the quickest way to stop it without killing the terminal?

Accepted Answer

Press Ctrl+C to send a KeyboardInterrupt

Answer

Ctrl+C sends SIGINT to the process, which Python converts to a `KeyboardInterrupt` and stops the loop.

(POC) Python Online Certification Practice Test