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In the preceding chapter we learned about Python s most important fundamental data types In this chapter we will extend our programming options by learning how to gather data items together using Python s collection data types We will cover tuples and lists, and also introduce new collection data types, including sets and dictionaries, and cover all of them in depth In addition to collections, we will also see how to create data items that are aggregates of other data items (like C or C++ structs or Pascal records) such items can be treated as a single unit when this is convenient for us, while the items they contain remain individually accessible Naturally, we can put aggregated items in collections just like any other items Having data items in collections makes it much easier to perform operations that must be applied to all of the items, and also makes it easier to handle collections of items read in from les We ll cover the very basics of text le handling in this chapter as we need them, deferring most of the detail (including error handling) to 7 After covering the individual collection data types, we will look at how to iterate over collections, since the same syntax is used for all of Python s collections, and we will also explore the issues and techniques involved in copying collections

A sequence type is one that supports the membership operator (in), the size function (len()), slices ([]), and is iterable Python provides ve built-in sequence types: bytearray, bytes, list, str, and tuple the rst two are covered

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One-Way Communication Pattern In the one-way communication pattern, messages are sent in only one direction, from the client to the server One-way communication is common when the sender does not need an informational response back right away; the sender just needs an acknowledgement that the message was sent After the message is sent, that is the end of the communication exchange The two interfaces used to facilitate one-way communication are the and the interface Figure 32 shows how messages ow between a client and server for one-way communication interface is responsible for sending In this pattern, the is responsible for receiving messages messages, and the channel Listing 31 shows a client application that uses the shape to send a message

The de nitions of what constitutes a sequence type, a set type, or a mapping type given in this chapter are practical but informal More formal de nitions are given in 8

[ Team LiB ]

separately in 7 Some other sequence types are provided in the standard library, most notably, collectionsnamedtuple When iterated, all of these sequences provide their items in order

We covered strings in the preceding chapter In this section we will cover tuples, named tuples, and lists

Duplex Communication Duplex communication uses two one-way channel shapes combined as shown in Figure 33 The into a third interface called

A tuple is an ordered sequence of zero or more object references Tuples support the same slicing and striding syntax as strings This makes it easy to extract items from a tuple Like strings, tuples are immutable, so we cannot replace or delete any of their items If we want to be able to modify an ordered sequence, we simply use a list instead of a tuple; or if we already have a tuple but want to modify it, we can convert it to a list using the list() conversion function and then apply the changes to the resultant list The tuple data type can be called as a function, tuple() with no arguments it returns an empty tuple, with a tuple argument it returns a shallow copy of the argument, and with any other argument it attempts to convert the given object to a tuple It does not accept more than one argument Tuples can also be created without using the tuple() function An empty tuple is created using empty parentheses, (), and a tuple of one or more items can be created by using commas Sometimes tuples must be enclosed in parentheses to avoid syntactic ambiguity For example, to pass the tuple 1, 2, 3 to a function, we would write function((1, 2, 3)) Figure 31 shows the tuple t = "venus", -28, "green", "21", 1974, and the index positions of the items inside the tuple Strings are indexed in the same way, but whereas strings have a character at every position, tuples have an object reference at each position

[ Team LiB ]

t[-5] 'venus' t[0] t[-4] -28 t[1] t[-3] 'green' t[2] t[-2] '21' t[3] t[-1] 1974 t[4]

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advantage of duplex communication over one-way or request-reply is that messages can be sent from either the client or the server

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