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Commonly used hooks for on_setattr.
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Run all *setters* and return the return value of the last one.
.. versionadded:: 20.1.0
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Prevent an attribute to be modified.
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Run *attrib*'s validator on *new_value* if it has one.
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Run *attrib*'s converter -- if it has one -- on *new_value* and return the
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