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NEW in Python 3.15: sentinel()

Python 3.15’s new sentinel type: Why it matters

Python 3.15's best new features

Python 3.15: Lazy Imports, Sentinel, Frozen Dictionaries...

Sentinel Values - Python

Loops - The sentinel-controlled loop

Python 3 Tutorial 19 - the Sentinel Value

Python Basics Ep11: Sentinels and Input Validation

Microsoft Sentinel API Tutorial 2025 | Python and Jupyter Notebook

Python - Sentinels

typing the `object()` sentinel!
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Last Updated: November 13, 2026
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