Slots In Python
The ability to override the class dictionary using a __slots__ declaration is supported only by new-style classes. When you add a __slots__ declaration to an old-style class it just creates a class attribute called ‘slots’.
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If you want to override the dictionary for a class, then ensure that the class is a new-style class. You can convert an old-style class to a new-style class by inheriting from object.
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- Both the rate and the setRate methods can be connected to, since any Python callable can be used as a slot. If the rate is changed, we update the private rate value and emit a custom rateChanged signal, giving the new rate as a parameter. We have also used the faster short-circuit syntax.
Example¶
In the following example the KeyedRef class is an old-style class (no inheritance). The __slots__ declaration in this class creates a class attribute called ‘slots’, the class dictionary is unaffected. The KeyedRef2 class is a new-style class so the __slots__ declaration causes special compact attributes to be created for each name in the slots list and saves space by not creating attribute dictionaries.
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References¶
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Python Glossary: New-style class.
Python Language Reference: New-style and classic classes, slots.