Python Coding challenge - Day 986| What is the output of the following Python Code?

 

Code Explanation:

1. Defining a Custom Metaclass

class Meta(type):

Meta is a metaclass because it inherits from type.

Metaclasses control class-level behavior, including how isinstance() works.

2. Overriding __instancecheck__

    def __instancecheck__(cls, obj):

        return obj == 5

__instancecheck__ is called whenever isinstance(obj, Class) is executed.

Instead of normal type checking, it compares the object value.

It returns:

True if obj is equal to 5

False otherwise

3. Defining Class A Using the Metaclass

class A(metaclass=Meta): pass

Class A is created using the metaclass Meta.

Any isinstance(..., A) check will now use Meta.__instancecheck__.

4. Evaluating isinstance(5, A)

isinstance(5, A)

Step-by-step:

Python sees A has a custom metaclass.

Calls:

Meta.__instancecheck__(A, 5)

obj == 5 → True

5. Evaluating isinstance(3, A)

isinstance(3, A)

Step-by-step:

Calls:

Meta.__instancecheck__(A, 3)

obj == 5 → False

6. Printing the Results

print(isinstance(5, A), isinstance(3, A))

Prints the results of both checks.

7. Final Output

True False

✅ Final Answer

✔ Output:

True False

500 Days Python Coding Challenges with Explanation