"""Solution 6.2.4 — Instance overriding shared default

Chapter 6: Objects — Everyday Programming

Bug type: Logical

Thermostat.target_c = 22 reassigns the shared *class* attribute, so both
rooms read 22 and the bedroom does not keep the default. Assigning to
the instance, kitchen.target_c = 22, creates an instance attribute that
shadows the class default for the kitchen only, leaving the bedroom at
20.

Exercise: ex_6_2_4.py
"""

class Thermostat:
    target_c = 20

    def __init__(self, room):
        self.room = room

kitchen = Thermostat("kitchen")
bedroom = Thermostat("bedroom")
kitchen.target_c = 22   # set only this instance

print(kitchen.target_c)   # 22
print(bedroom.target_c)   # 20