You want to track how many objects of class Book are currently alive. Which approach best fits this requirement?

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Python - Classes and Object Lifecycle

You want to track how many objects of class Book are currently alive. Which approach best fits this requirement?

AUse a class variable incremented in __init__ and decremented in __del__

BPrint a message in __init__ only

CUse a global variable unrelated to the class

DCount objects manually outside the class

Step-by-Step Solution

Solution:

Step 1: Understand tracking object count
Using a class variable allows counting all instances by updating it on creation and deletion.
Step 2: Match approach to requirement
Incrementing in __init__ and decrementing in __del__ keeps an accurate live count inside the class.
Final Answer:
Use a class variable incremented in __init__ and decremented in __del__ -> Option A
Quick Check:
Track live objects = Class variable update in lifecycle [OK]

Quick Trick: Use class variables to track instances in __init__ and __del__ [OK]

Common Mistakes:

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