Python (12) classes and objects

classes and objects

    kind

    object

    Object-oriented OO (Object-oriented): integration, encapsulation, polymorphism

    OOA -> OOD -> OOP

    self keyword, similar to java's this

    Magic method: __init__(self)\__new__(cls[,...])\__del__(self)

    Control permission: public\private (pseudo-private, name mangling: name mangling)

    combination

    

    to give a few examples

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    1. Define a class and create an instance

    

     

    2，

 

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    Some related BIFs

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    issubclass(subclass, classs)

    isinstance(object, class)

    hasattr(object, name)

    getattr(object, name[,default])

    setattr(object, name, value)

    delattr(obj, name)

 

    

 

 

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    Construct __init__(self) and destruct __del__(self)

    

 

 

    

    Descriptor (Property Principle)

    A descriptor is an attribute that assigns an instance of a particular type of class to another class.