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Python Foundations for DevOps

The Python fundamentals you actually need for automation — variables, data types, conditionals, loops, and functions — used to build a real DevOps script: a system health checker that reads CPU, memory, and disk usage and compares them against thresholds.

What you'll learn

  • Variables, data types, operators, and type casting
  • if / elif / else, for and while loops
  • Writing functions
  • Reading live system metrics with psutil
  • Basic try / except error handling

Setup

python3 -m venv venv
source venv/bin/activate
pip install -r requirements.txt

Files

  • variables.py — variables, data types, operators
  • control_flow.py — if/else and loops
  • functions.py — functions
  • system_health.py — the main one: CPU/memory/disk health report
python variables.py
python system_health.py

system_health.py prints something like:

=== System Health Report ===
CPU    : 12.4%  -> Healthy
Memory : 63.1%  -> Healthy
Disk   : 78.0%  -> WARNING (above 75%)
Overall: NEEDS ATTENTION

Practice

Write your own system_health.py from scratch:

  1. Ask the user for a CPU threshold with input() and cast it to a number.
  2. Read current CPU usage with psutil.cpu_percent(interval=1).
  3. Print whether the CPU is healthy or over the threshold.
  4. Bonus: also check memory (psutil.virtual_memory().percent) and disk (psutil.disk_usage("/").percent).
  5. Bonus: wrap the input in try / except ValueError so bad input doesn't crash it.