P11.3 Many Objects in a List: Classes with Real Data

Step 1 — What we do. A hospital in Chennai tracks patients and flags fever.

Step 2 — Type and run this code.

class Patient:
    def __init__(self, name, temp_f):
        self.name = name
        self.temp_f = temp_f

    def has_fever(self):
        return self.temp_f >= 100.4

ward = [Patient("Anil", 98.6), Patient("Fatima", 101.2), Patient("Grace", 100.4)]
for p in ward:
    if p.has_fever():
        print(p.name, "has fever")

Step 3 — Output you should see.

Fatima has fever
Grace has fever

Step 4 — What it means. Each object answers the same question with its own data.

Step 1 — What we do. Delivery vans and their loads for a logistics company in Rotterdam.

Step 2 — Type and run this code.

class Van:
    def __init__(self, van_id, parcels):
        self.van_id = van_id
        self.parcels = parcels

fleet = [Van("V1", 120), Van("V2", 95), Van("V3", 140)]
print(sum(v.parcels for v in fleet))
busiest = max(fleet, key=lambda v: v.parcels)
print(busiest.van_id)

Step 3 — Output you should see.

355
V3

Step 4 — What it means. Sums and max with key= work on objects too.