linuxexpert-practice-labs/labs/linux-plus/4-3-1-python-basics

Linux+ 4.3.1: Python for administrators

A virtual environment with pinned requirements, the chapter's disk report, running a command from Python and parsing its JSON, and a style check.

Before you start

Work as root, so ~ is /root. The VM needs internet access to install from PyPI. The lab only checks that ~/py doesn't exist yet. Write answers to the files in /root/lab-answers/.

Tasks

1. In ~/py, create the virtual environment .venv and install pyyaml into it. Load some YAML with it, save the installed packages to ~/py/requirements.txt with pip freeze, and see that the system's python3 can't import yaml (unless the distribution's package is installed).
2. Save the disk report from the chapter as ~/py/disk.py, run it, and check its exit code.
3. From Python, run ip -j addr, parse the JSON, and print each interface's name with its list of addresses. Save the output in /root/lab-answers/3.
4. Install flake8 into the virtual environment and check ~/py/disk.py with it until it reports nothing.

Hints

• Ubuntu needs python3-venv and python3-pip first; python3 -m venv .venv && source .venv/bin/activate, pip install, pip freeze > requirements.txt, deactivate.
• The report uses shutil.disk_usage for /, /var and /home, prints MOUNT PERCENT% lines, and exits 1 if any is at 80% or more.
• subprocess.run(["ip", "-j", "addr"], capture_output=True, text=True), json.loads, link.get("addr_info", []), a["local"].
• pip install flake8, flake8 ~/py/disk.py.