Python Coding challenge - Day 1020| What is the output of the following Python Code?

 

1. Defining a Metaclass

class Meta(type):

A metaclass named Meta is defined.

It inherits from type, which is the default metaclass in Python.

Metaclasses control class-level behavior.

2. Overriding __instancecheck__

    def __instancecheck__(cls, obj):

        return obj == 1

__instancecheck__ is a special method used by isinstance().

Whenever isinstance(obj, SomeClass) is called:

SomeClass.__instancecheck__(obj)

is executed (if defined).

Here, it ignores the actual type of obj.

It returns:

True only if obj == 1

False otherwise

3. Creating a Class Using the Metaclass

class Test(metaclass=Meta): pass

A class named Test is created.

Instead of the default metaclass (type), it uses Meta.

This means Test inherits the customized __instancecheck__.

4. First isinstance Call

isinstance(1, Test)

Step-by-step:

Python detects that Test has a metaclass with __instancecheck__.

Executes:

Meta.__instancecheck__(Test, 1)

Evaluates:

1 == 1  → True

Result:

True

5. Second isinstance Call

isinstance(2, Test)

Step-by-step:

Python calls:

Meta.__instancecheck__(Test, 2)

Evaluates:

2 == 1 → False

❌ Result:

False

6. Printing the Results

print(isinstance(1, Test), isinstance(2, Test))

Prints both boolean results.

7. Final Output

True False

✅ Final Answer

✔ Output:

True False

900 Days Python Coding Challenges with Explanation