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Learn  /  Python Fundamentals  /  Unit 13  /  Lab 2
Lab 2 of 5  ·  Open-Ended

Write validator.py — Validation Logic

Objective: Write a custom exception and a validate_device() function that checks required fields, IP format, and VLAN range.
Instructions

Inside capstone/, write validator.py from scratch.

It must define:

  1. InvalidDeviceRecord(Exception) — a custom exception class
  2. REQUIRED_FIELDS — a list of the five fields every record must have
  3. validate_device(record) — raises InvalidDeviceRecord with a specific message for each failure:
  4. If a required field is missing: Missing field: <field>
  5. If the IP does not look like four dot-separated groups of digits: Invalid IP: <ip>
  6. If the VLAN is not between 1 and 4094: VLAN out of range: <vlan>
  7. Returns True if all checks pass

Check fields in the order listed above — missing fields first, then IP, then VLAN.

Do not copy from the lesson. You wrote a custom exception in Unit 8 and used regex in Unit 10.

Paste your completed validator.py below and submit.

💡 Show Hint
class InvalidDeviceRecord(Exception): pass. Loop through REQUIRED_FIELDS and raise if field not in record. Use re.match(r"^\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}$", record["ip"]) for the IP check. int(record["vlan"]) to check the range.
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