Python Coding challenge - Day 932| What is the output of the following Python Code?

 

Code Explanation:

1. Defining the Descriptor Class

class Field:

A class named Field is defined.

This class is a descriptor because it implements the __get__ method.

2. Implementing the __get__ Method

    def __get__(self, obj, owner):

        return "system"

__get__ is automatically called when the attribute is accessed.

Parameters:

obj → the instance accessing the attribute (r)

owner → the class (Record)

The method always returns the string "system".

So:

Any access to the managed attribute will return "system" regardless of stored values.

3. Defining the Class That Uses the Descriptor

class Record:

    status = Field()

A class named Record is defined.

The class attribute status is assigned an instance of Field.

This makes status a managed attribute controlled by the descriptor.

4. Creating an Instance of Record

r = Record()

An object r of class Record is created.

At this point:

r.__dict__ = {}

5. Manually Setting an Instance Attribute

r.__dict__["status"] = "user"

This directly inserts "status": "user" into the instance’s dictionary.

Now:

r.__dict__ = {"status": "user"}

6. Accessing r.status

print(r.status)

Here’s what Python does internally:

It sees r.status.

It checks the class Record and finds that status is a descriptor.

Descriptors take priority over instance dictionary values.

So Python calls:

Field.__get__(descriptor, r, Record)

__get__ returns "system".

So the instance value "user" is ignored.

7. Final Output

system

Final Answer

✔ Output:

system

400 Days Python Coding Challenges with Explanation