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create a large number of objects, using _ _slots_ _ can result in a substantial reduction in memory use and execution time Be aware that the use of _ _slots_ _ has a tricky interaction with inheritance If a class inherits from a base class that uses _ _slots_ _, it also needs to define _ _slots_ _ for storing its own attributes (even if it doesn t add any) to take advantage of the benefits _ _slots_ _ provides If you forget this, the derived class will run slower and use even more memory than what would have been used if _ _slots_ _ had not been used on any of the classes! The use of _ _slots_ _ can also break code that expects instances to have an underlying _ _dict_ _ attribute Although this often does not apply to user code, utility libraries and other tools for supporting objects may be programmed to look at _ _dict_ _ for debugging, serializing objects, and other operations Finally, the presence of _ _slots_ _ has no effect on the invocation of methods such as _ _getattribute_ _(), _ _getattr_ _(), and _ _setattr_ _() should they be redefined in a class However, the default behavior of these methods will take _ _slots_ _ into account In addition, it should be stressed that it is not necessary to add method or property names to _ _slots_ _, as they are stored in the class, not on a per-instance basis

User-defined objects can be made to work with all of Python s built-in operators by adding implementations of the special methods described in 3 to a class For example, if you wanted to add a new kind of number to Python, you could define a class in which special methods such as _ _add_ _() were defined to make instances work with the standard mathematical operators The following example shows how this works by defining a class that implements the complex numbers with some of the standard mathematical operators

5

All the servlets that access the bookstore database ( , , , and initialize a variable in their method that points to the database helper object created by the Web context listener:

Because Python already provides a complex number type, this class is only provided for the purpose of illustration

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class Complex(object): def _ _init_ _(self,real,imag=0): selfreal = float(real) selfimag = float(imag) def _ _repr_ _(self): return "Complex(%s,%s)" % (selfreal, selfimag) def _ _str_ _(self): return "(%g+%gj)" % (selfreal, selfimag) # self + other def _ _add_ _(self,other): return Complex(selfreal + otherreal, selfimag + otherimag) # self - other def _ _sub_ _(self,other): return Complex(selfreal - otherreal, selfimag - otherimag)

In the example, the _ _repr_ _() method creates a string that can be evaluated to recreate the object (that is, "Complex(real,imag)")This convention should be followed for all user-defined objects as applicable On the other hand, the _ _str_ _() method

After the Web container loads and instantiates the servlet class and before it delivers requests from clients, the Web container initializes the servlet You can customize this process to allow the servlet to read persistent configuration data, initialize resources, and perform any other one-time activities by overriding the method of the interface A servlet that cannot complete its initialization process should throw

creates a string that s intended for nice output formatting (this is the string that would be produced by the print statement) The other operators, such as _ _add_ _() and _ _sub_ _(), implement mathematical operations A delicate matter with these operators concerns the order of operands and type coercion As implemented in the previous example, the _ _add_ _() and _ _sub_ _() operators are applied only if a complex number appears on the left side of the operatorThey do not work if they appear on the right side of the operator and the left-most operand is not a Complex For example:

import javaxswing*; public class Simple1 { private static JFrame frame; private static JPanel myPanel; private JButton button1; private JButton button2;

>>> c = Complex(2,3) >>> c + 40 Complex(60,30) >>> 40 + c Traceback (most recent call last): File "<stdin>", line 1, in <module> TypeError: unsupported operand type(s) for +: 'int' and 'Complex' >>>

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