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The operation c + 40 works partly by accident All of Python s built-in numbers already have real and imag attributes, so they were used in the calculation If the other object did not have these attributes, the implementation would break If you want your implementation of Complex to work with objects missing these attributes, you have to add extra conversion code to extract the needed information (which might depend on the type of the other object) The operation 40 + c does not work at all because the built-in floating point type doesn t know anything about the Complex classTo fix this, you can add reversedoperand methods to Complex:

te l vr eS t i ni }

class Complex(object): def _ _radd_ _(self,other): return Complex(otherreal + selfreal, otherimag + selfimag) def _ _rsub_ _(self,other): return Complex(otherreal - selfreal, otherimag - selfimg)

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These methods serve as a fallback If the operation 40 + c fails, Python tries to execute c_ _radd_ _(40) first before issuing a TypeError Older versions of Python have tried various approaches to coerce types in mixedtype operations For example, you might encounter legacy Python classes that implement a _ _coerce_ _() methodThis is no longer used by Python 26 or Python 3 Also, don t be fooled by special methods such as _ _int_ _(), _ _float_ _(), or _ _complex_ _() Although these methods are called by explicit conversions such as int(x) or float(x), they are never called implicitly to perform type conversion in mixed-type arithmetic So, if you are writing classes where operators must work with mixed types, you have to explicitly handle the type conversion in the implementation of each operator

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The service provided by a servlet is implemented in the method of a , the methods (where can take the value , , , , , ) of an , or any other protocolspecific methods defined by a class that implements the interface In the rest of this chapter, the term service method will be used for any method in a servlet class that provides a service to a client The general pattern for a service method is to extract information from the request, access external resources, and then populate the response based on that information For HTTP servlets, the correct procedure for populating the response is to first fill in the response headers, then retrieve an output stream from the response, and finally write any body content to the output stream Response headers must always be set before a or is retrieved because the HTTP protocol expects to receive all headers before body content The next two sections describe how to get information from requests and generate responses

When you create an instance of a class, the type of that instance is the class itselfTo test for membership in a class, use the built-in function isinstance(obj,cname)This

function returns True if an object, obj, belongs to the class cname or any class derived from cname Here s an example:

class A(object): pass class B(A): pass class C(object): pass a = A() b = B() c = C() type(a) isinstance(a,A) isinstance(b,A) isinstance(b,C) # Instance of 'A' # Instance of 'B' # Instance of 'C' # # # # Returns Returns Returns Returns the class object A True True, B derives from A False, C not derived from A

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Similarly, the built-in function issubclass(A,B) returns True if the class A is a subclass of class B Here s an example:

A subtle problem with type-checking of objects is that programmers often bypass inheritance and simply create objects that mimic the behavior of another object As an example, consider these two classes:

A request contains data passed between a client and the servlet All requests implement the interface This interface defines methods for accessing the following information: Parameters, which are typically used to convey information between clients and servlets Object-valued attributes, which are typically used to pass information between the servlet container and a servlet or between collaborating servlets Information about the protocol used to communicate the request and the client and server involved in the request Information relevant to localization

class Foo(object): def spam(self,a,b): pass class FooProxy(object): def _ _init_ _(self,f): selff = f def spam(self,a,b): return selffspam(a,b)

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