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This Bug Is In Your Code: Why does __var silently become _Class__var in subclasses?

Python Short: Why does __var silently become _Class__var in subclasses?

In this Python short:
- The bug shown
- Why Python does this
- The correct fix

Explanation: The bug is that __secret in Child creates a distinct _Child__secret attribute, not overriding Base's _Base__secret. Python name-mangles double-underscore vars to prevent accidental overrides across inheritance chains, resolving to _ClassName__var internally. To override, explicitly use the mangled n

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