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What does it mean to "program to an interface"?

language-agnosticoopinterface
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Why use getters and setters/accessors?

javaoopsettergetterabstraction
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Prefer composition over inheritance?

language-agnosticinheritanceoopcompositionaggregation
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What is the `self` parameter in class methods?

pythonoopclassself
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What are metaclasses in Python?

pythonoopmetaclasspython-classpython-datamodel
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