Preventing Base Class Instantiation

Medium Abstraction & Interfaces

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Problem Statement

A developer forgot to inherit from `abc.ABC` but threw a `NotImplementedError` in the base method to emulate an abstract class. Show this alternate pattern: Create `BaseWorker` with `work(self)` that raises `NotImplementedError`. Subclass it with `Coder` and print ‘Coding…’.

Input Format

None

Output Format

Print the implementation output.

Constraints

None

Sample Output

Coding...

Explanation

Before the 'abc' module, raising NotImplementedError was the standard pythonic way to enforce method implementation in subclasses.

Starter Code

class BaseWorker:
    def work(self):
        # Raise error here
        pass

class Coder(BaseWorker):
    # Implement work
    pass

if __name__ == '__main__':
    c = Coder()
    c.work()

Limits

Time Limit: 1s
Memory Limit: 256MB

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