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The data buffer is a byte array with an offset and a length An application can access the byte array either directly or indirectly through the datagram's DataInputStream for reading and DataOutputStream for writing The datagram's getOffset and setOffset methods are the accessor methods for the offset of the first byte of data The getLength and setLength methods are the accessor methods for the number of bytes of data in the datagram The data buffer, offset, and length must be set before the Datagram is sent Before receiving a Datagram, the buffer, offset, and length must also be set to indicate the bytes available to store the incoming message

p = ShapePoint(3, 9) repr(p) q = eval(p__module__ + "" + repr(p)) repr(q)

# returns: 'Point(3, 9)' # returns: 'Point(3, 9)'

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We must give the module name when eval()-ing if we used import Shape (This would not be necessary if we had done the import differently, for example, from Shape import Point) Python provides every object with a few private attributes, one of which is __module__, a string that holds the object s module name, which in this example is "Shape" At the end of this snippet we have two Point objects, p and q, both with the same attribute values, so they compare as equal The eval() function returns the result of executing the string it is given which must contain a valid Python statement

def __str__(self): return "({0x!r}, {0y!r})"format(self)

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The built-in str() function works like the repr() function, except that it calls the object s __str__() special method The result is intended to be understandable to human readers and is not expected to be suitable for passing to the eval() function Continuing the previous example, str(p) (or str(q)) would return the string '(3, 9)' We have now covered the simple Point class and also covered a lot of behindthe-scenes details that are important to know but which can mostly be left in the background The Point class holds an (x, y) coordinate a fundamental part of what we need to represent a circle, as we discussed at the beginning of the chapter In the next subsection we will see how to create a custom Circle class, inheriting from Point so that we don t have to duplicate the code for the x and y attributes or for the distance_from_origin() method

The Circle class builds on the Point class using inheritance The Circle class adds one additional data attribute (radius), and three new methods It also reimplements a few of Point s methods Here is the complete class de nition:

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class Circle(Point): def __init__(self, radius, x=0, y=0): super()__init__(x, y) selfradius = radius def edge_distance_from_origin(self): return abs(selfdistance_from_origin() - selfradius)

def area(self): return mathpi * (selfradius ** 2) def circumference(self): return 2 * mathpi * selfradius def __eq__(self, other): return selfradius == otherradius and super()__eq__(other) def __repr__(self): return "Circle({0radius!r}, {0x!r}, {0y!r})"format(self) def __str__(self): return repr(self)

The CommConnection interface defines an API for a logical serial port connection The CommConnection extends the StreamConnection interface, through which bytes are transferred using input and output streams The underlying operating system defines the logical serial ports that can be used Such a port does not need to correspond to a physical RS-232 serial port For instance, IrDA IRCOMM ports are commonly configured as logical serial ports within the device An application opens a serial port by calling the Connectoropen method The application must provide a URI string that begins with "comm:" followed by a port identifier, followed optionally by a semicolon and a semicolon-separated list of parameter-value pairs The name of a parameter is separated from its value with an equals sign (=) Spaces are not allowed in the string For example, "comm:COM0;baudrate=19200" is a valid string

Inheritance is achieved simply by listing the class (or classes) that we want our class to inherit in the class line Here we have inherited the Point class the inheritance hierarchy for Circle is shown in Figure 63

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object __new__() __init__() __eq__() __repr__() __str__() Point x y __new__() __init__() distance_from_origin() __eq__() __repr__() __str__() Circle x y radius __new__() __init__() distance_from_origin() edge_distance_from_origin() area() circumference() __eq__() __repr__() __str__()

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