NotImplementedError — Expert Playground

Raised to indicate an abstract method must be overridden

Python Playground

# Exception groups (Python 3.11+)
import sys
print(f"Python {sys.version}")

# Exception hierarchy inspection
print(f"NotImplementedError MRO:")
for cls in NotImplementedError.__mro__:
    print(f"  {cls.__name__}")

# Exception attributes
try:
    raise NotImplementedError("not implemented yet")
except NotImplementedError as e:
    print(f"\nException attributes:")
    print(f"  args: {e.args}")
    print(f"  __traceback__: {type(e.__traceback__)}")

    # Traceback manipulation
    import traceback
    tb_lines = traceback.format_exception(type(e), e, e.__traceback__)
    print(f"  Traceback lines: {len(tb_lines)}")

Output

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Understanding the exception hierarchy and traceback system helps build robust error handling and debugging tools.

Challenge

Try modifying the code above to explore different behaviors. Can you extend the example to handle a new use case?

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