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We have set the class s metaclass to be abcABCMeta since this is a requirement for ABCs; any abcABCMeta subclass can be used instead, of course We have made __init__() an abstract method to ensure that it is reimplemented, and we have also provided an implementation which we expect (but can t force) inheritors to call To make an abstract readable/writable property we cannot use decorator syntax; also we have not used private names for the getter and setter since doing so would be inconvenient for subclasses The price property is abstract (so we cannot use the @property decorator), and is readable/writable Here we follow a common pattern for when we have private readable/writable data (eg, __price) as a property: We initialize the property in the __init__() method rather than setting the private data directly this ensures that the setter is called (and may potentially do validation or other work, although it doesn t in this particular example) The model property is not abstract, so subclasses don t need to reimplement it, and we can make it a property using the @property decorator Here we follow a common pattern for when we have private read only data (eg, __model) as a property: We set the private __model data once in the __init__() method, and provide read access via the read only model property Note that no Appliance objects can be created, because the class contains abstract attributes Here is an example subclass:

We use trapezoidal integration to numerically solve the integral The idea is to fill the area under a curve with a series of rectangles As the width of the rectangles approaches 0, the sum of the areas of the rectangles approaches the value of the integral A program to carry out this calculation on a single processor is shown in Fig 524 To keep the program as simple as possible, we fix the number of steps to use in the integration at 1,000,000 The variable sum is initialized to 0 and the step size is computed as the range in x (equal to 10 in this

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When we name our tables, we use a convention of prefacing the table with tbl_ followed by a meaningful name We do this so that you can quickly identify a table when looking at objects or queries Some people would argue that it is obvious which objects are tables, because they are listed as tables in the SQL Server tools and they are always referenced in the same places in T-SQL statements We agree with the first argument, but as for the second, it forgets about views Views and tables are referenced in the same way, and it is often helpful to be able to quickly identify whether a view or table is being used when you re looking at a T-SQL statement Additionally, you might need to look at documentation, such as a data dictionary, offline It is again helpful to be able to quickly identify your tables As for the actual name, we make sure it s meaningful and we separate words with underscore characters One other important note: We never pluralize the names of our tables The table is named for the data it holds, as in tbl_customer; even though it holds multiple customers, we do not name the table tbl_customers Here are some of the tables you will see in the Mountain View Music database:

class Cooker(Appliance): def __init__(self, model, price, fuel): super()__init__(model, price) selffuel = fuel price = property(lambda self: super()price, lambda self, price: super()set_price(price))

The Cooker class must reimplement the __init__() method and the price property For the property we have just passed on all the work to the base class The model read-only property is inherited We could create many more classes based on Appliance, such as Fridge, Toaster, and so on The next ABC we will look at is even shorter; it is an ABC for text- ltering functors (in le TextFilterpy):

case) divided by the number of steps The area of each rectangle is the width (the step size) times the height (the value of the integrand at the center of the interval) The width is a constant, so we pull it out of the summation and multiply the sum of the rectangle heights by the step size, step, to get our estimate of the definite integral

class TextFilter(metaclass=abcABCMeta): @abcabstractproperty def is_transformer(self): raise NotImplementedError() @abcabstractmethod def __call__(self): raise NotImplementedError()

The TextFilter ABC provides no functionality at all; it exists purely to de ne an interface, in this case an is_transformer read-only property and a __call__() method, that all its subclasses must provide Since the abstract property and method have no implementations we don t want subclasses to call them, so instead of using an innocuous pass statement we raise an exception if they are used (eg, via a super() call) Here is one simple subclass:

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