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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:

== 0) {

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class ColoredPoint extends Point implements Colorable { int color; }

a, b = (b, a)

== 0) {

public getNumberOfScales() { return 91; } }

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:

Here is an example of an illegal multiple inheritance of an interface:

t = new Teex(frame, prefs); }

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

This requirement was introduced in order to support translation by type erasure ( 46)

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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:

We can now run the application and specify LDAP preferences, using the following command:

A class body may contain declarations of members of the class, that is, elds ( 83), classes ( 85), interfaces ( 85) and methods ( 84) A class body may also contain instance initializers ( 86), static initializers ( 87), and declarations of constructors ( 88) for the class

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

ClassBody: { ClassBodyDeclarationsopt }

The rst time through there will be no preferences in the directory But if settings are changed, they will be saved on program exit and restored the next time the application is run

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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:

ClassBodyDeclarations: ClassBodyDeclaration ClassBodyDeclarations ClassBodyDeclaration ClassBodyDeclaration: ClassMemberDeclaration InstanceInitializer StaticInitializer ConstructorDeclaration

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

Storing each preference value as a unique attribute is convenient It is easy to use LDAPSearch or any other LDAP client to inspect and adjust the values if necessary, and more than one application can share certain preferences However, there is also a major disadvantage: whenever you add a new preference to your application, you must de ne a new attribute and add it to the directory schema You must also modify the object class de nition for the preferences object class to include the new attribute Generally, only privileged users have permission to change the directory schema With a corporate directory, application developers may not be allowed to make random changes to the schema There may also be problems with interoperability if data is synchronized between the directory and other data sources, or replicated to other directories Every schema change must be carefully copied to each participant in replication agreements with the server One way to ensure exibility for adding new preference values in the future is to store all values in a single object The schema needs to be modi ed only once to allow this compound attribute LDAPPreferences2 (Figure 11-5) implements the compound object model by serializing a Hashtable with all preferences and storing the serialized value as a single attribute in the user entry In other respects LDAPPreferences2 is identical to LDAPPreferences1, so only the differences will be presented here LDAPPreferences2initialize speci es a single attribute to read from the user entry, rather than null (for all attributes):

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