Code Explanation:
🔹 1. Importing the weakref Module
import weakref
✅ Explanation
weakref is Python's built-in module for creating weak references to objects.
It lets you work with objects without increasing their reference count.
It is commonly used for memory management and cleanup operations.
Think of it as a watcher that monitors an object.
Program
↓
weakref Module
↓
Watch Objects
↓
Perform Cleanup
Nothing is created yet.
🔹 2. Creating a Class
class Test:
pass
✅ Explanation
A class named Test is created.
pass means the class has no attributes or methods.
It is simply a blueprint for creating objects.
Current Structure
Test
↓
Empty Class
No object exists yet.
🔹 3. Creating an Object
obj = Test()
✅ Explanation
Python creates an object of the Test class.
Current Memory
obj
↓
<Test Object>
Visual Representation
obj
↓
┌──────────┐
│ Test │
└──────────┘
The object is alive in memory.
🔹 4. Registering a Finalizer
f = weakref.finalize(obj, print, "Destroyed")
✅ Explanation
This is the most important line.
weakref.finalize() registers a function that will automatically run when obj is garbage collected.
Syntax:
weakref.finalize(object, function, *arguments)
Here,
Object → obj
Function → print
Argument → "Destroyed"
Current Memory
obj
↓
<Test Object>
│
▼
Finalizer
↓
print("Destroyed")
The message is not printed now.
It is only scheduled for the future.
🔹 5. Understanding the Finalizer
✅ Explanation
weakref.finalize() creates a finalizer object.
Current Memory
f
↓
Finalize Object
Its job is:
Wait
↓
Object Destroyed
↓
Run print("Destroyed")
It continuously watches the object.
🔹 6. Checking the alive Property
f.alive
✅ Explanation
The alive attribute tells whether the finalizer is still active.
Current Situation
Object Exists
↓
Yes
↓
Finalizer Active
↓
alive = True
Since obj still exists, the finalizer has not executed.
Returned value
True
🔹 7. Printing the Result
print(f.alive)
✅ Explanation
Python prints the value of f.alive.
Output
True
🎯 Final Output
True
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