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Learn  /  Python Fundamentals  /  Unit 9  /  Lab 4
Lab 4 of 5  ·  Semi-Guided

Build a DeviceInventory Class with __iter__

Objective: Create a DeviceInventory class that makes a list of device records iterable as NetworkDevice objects.
Instructions

Create a file called lab4.py. Write a DeviceInventory class that:

  1. Takes a list of raw dictionaries in __init__ and stores them
  2. Implements __len__ to return the number of records
  3. Implements __iter__ using yield — each iteration yields a NetworkDevice object built from the next raw record

Use this raw data:

raw_data = [
    {"name": "sw-core-01",   "ip": "10.1.1.1",   "type": "switch", "site": "HQ", "vlan": 10},
    {"name": "sw-access-01", "ip": "10.1.1.2",   "type": "switch", "site": "HQ", "vlan": 20},
    {"name": "rtr-edge-01",  "ip": "10.1.1.254", "type": "router", "site": "HQ", "vlan": 1},
]

Then use the class:

inventory = DeviceInventory(raw_data)
print(f"Loaded {len(inventory)} devices")
for device in inventory:
    print(f"{device.name} | {device.ip} | {device.device_type} | VLAN {device.vlan}")

Your output must match exactly:

Loaded 3 devices
sw-core-01 | 10.1.1.1 | switch | VLAN 10
sw-access-01 | 10.1.1.2 | switch | VLAN 20
rtr-edge-01 | 10.1.1.254 | router | VLAN 1

Run it with python3 lab4.py. Paste your output below and submit.

💡 Show Hint
def __iter__(self): then for record in self._raw: then yield NetworkDevice(record["name"], record["ip"], record["type"], record["site"], record["vlan"]). Include NetworkDevice class at the top of lab4.py — do not import it.
Paste Your Output
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