advanced programming techniques for getter_name in [key for key in dictionary if key startswith("get_")]if isinstance(dictionary[getter_name]collections callable)name getter_name[ :slots append("__namegetter dictionary pop(getter_namesetter_name "set_name setter dictionary get(setter_namenoneif (setter is not none and isinstance(settercollections callable))del dictionary[setter_namedictionary[nameproperty(gettersetterdictionary["__slots__"tuple(slotsreturn super(__new__(mclclassnamebasesdictionarya metaclass' __new__(class method is called with the metaclassand the class namebase classesand dictionary of the class that is to be created we must use reimplementation of __new__(rather than __init__(because we want to change the dictionary before the class is created we begin by copying the __slots__ collectioncreating an empty one if none is presentand making sure we have list rather than tuple so that we can modify it for every attribute in the dictionary we pick out those that begin with "get_and that are callablethat isthose that are getter methods for each getter we add private name to the slots to store the corresponding datafor examplegiven getter get_name(we add __name to the slots we then take reference to the getter and delete it from the dictionary under its original name (this is done in one go using dict pop()we do the same for the setter if one is presentand then we create new dictionary item with the desired property name as its keyfor exampleif the getter is get_name(the property name is name we set the item' value to be property with the getter and setter (which might be nonethat we have found and removed from the dictionary at the end we replace the original slots with the modified slots list which has private slot for each property that was addedand call on the base class to actually create the classbut using our modified dictionary note that in this case we must pass the metaclass explicitly in the super(callthis is always the case for calls to __new__(because it is class method and not an instance method for this example we didn' need to write an __init__(method because we have done all the work in __new__()but it is perfectly possible to reimplement both __new__(and __init__(doing different work in each if we consider hand-cranked drills to be analogous to aggregation and inheritance and electric drills the analog of decorators and descriptorsthen metaclasses are at the laser beam end of the scale when it comes to power and