StopIteration — Expert Playground

Raised by next() to signal that an iterator is exhausted

Python Playground

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

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

# Exception attributes
try:
    it = iter([]); next(it)
except StopIteration 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

Click "Run" to execute your code

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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