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Channels use channel shapes to implement the various types of message exchange patterns that they support For example, a transport channel and based on TCP would implement the because these transports are inherently one-way Other transports based on other protocols such as TCP may implement multiple channel shapes Developers do not work with channel shapes directly Instead, WCF chooses of a service Table 31 the channel shape based on the and the lists the various attributes that you can set on an resulting channel shape Notice that most channel shapes have a sessionless (default) and session-aware variant Session-aware channels pass an identi er from the client to the server This can be used to maintain state between client and server This is similar to how ASPNET does state management There is no state-management feature built in to WCF, but you can use sessions with instancing to be able to manage state Instance management is described in 5, Behaviors

This is certainly more meaningful than writing aircraft[2][1], but it involves creating lots of variables and is rather ugly We will see an alternative in the next subsection In the rst two lines of the aircraft code snippet, we assigned to tuples in both statements When we have a sequence on the right-hand side of an assignment (here we have tuples), and we have a tuple on the left-hand side, we say that the right-hand side has been unpacked Sequence unpacking can be used to swap values, for example:

a, b = (b, a)

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Strictly speaking, the parentheses are not needed on the right, but as we noted earlier, the coding style used in this book is to omit parentheses for left-hand operands of binary operators and right-hand operands of unary statements, but to use parentheses in all other cases We have already seen examples of sequence unpacking in the context of for in loops Here is a reminder:

Not all channels implement each of these interfaces If the underlying channel does not support a particular channel shape, WCF will try to adapt

for x, y in ((-3, 4), (5, 12), (28, -45)): print(mathhypot(x, y))

A named tuple behaves just like a plain tuple, and has the same performance characteristics What it adds is the ability to refer to items in the tuple by name as well as by index position, and this allows us to create aggregates of data items The collections module provides the namedtuple() function This function is used to create custom tuple data types For example:

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Sale = collectionsnamedtuple("Sale", "productid customerid date quantity price")

an existing channel shape to suit its needs For example, if a channel does and interfaces for onenot implement the or the way communication, WCF will try to use either the instead

The rst argument to collectionsnamedtuple() is the name of the custom tuple data type that we want to be created The second argument is a string of spaceseparated names, one for each item that our custom tuples will take The rst argument, and the names in the second argument, must all be valid Python identi ers The function returns a custom class (data type) that can be used to create named tuples So, in this case, we can treat Sale just like any other Python class (such as tuple), and create objects of type Sale (In object-oriented terms, every class created this way is a subclass of tuple; object-oriented programming, including subclassing, is covered in 6) Here is an example:

sales = [] salesappend(Sale(432, 921, "2008-09-14", 3, 799)) salesappend(Sale(419, 874, "2008-09-15", 1, 1849))

The UDPDatagramConnection interface extends the interface javamicroeditionioDatagramConnection to define a UDP datagram connection (Refer to the documentation of interface DatagramConnection on page 69) The UDP datagram protocol is defined by the IETF standard RFC768 [reference 1] The protocol is message-oriented; delivery and duplicate protection are not guaranteed Applications use UDP datagram connections to exchange messages with minimal overhead, but if ordered reliable delivery of streams of data is required, a SocketConnection is a better choice An application opens a UDP datagram connection by calling the Connectoropen method The application must provide a URI string that starts with "datagram://" and is followed by a host name and port number separated by a colon If the string has neither the host nor port fields, the device allocates an available port If the connection string is invalid, an IllegalArgumentException is thrown

Here we have created a list of two Sale items, that is, of two custom tuples We can refer to items in the tuples using index positions for example, the price of the rst sale item is sales[0][-1] (ie, 799) but we can also use names, which makes things much clearer:

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