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The chapter began by introducing the various syntaxes that can be used for importing packages, modules, and objects inside modules We noted that many programmers only use the import importable syntax so as to avoid name clashes, and that we must be careful not to give a program or module the same name as a top-level Python module or directory Also discussed were Python packages These are simply directories with an __init__py le and one or more py modules inside them The __init__py le can be empty, but to support the from importable import * syntax, we can create an __all__ special variable in the __init__py le set to a list of module names We can also put any common initialization code in the __init__py le It was noted that packages can be nested simply by creating subdirectories and having each of these contain its own __init__py le Two custom modules were described The rst just provided a few functions and had very simple doctests The second was more elaborate with its own exceptions, the use of dynamic function creation to create a function with a platform-speci c implementation, private global data, a call to an initialization function, and more elaborate doctests About half the chapter was devoted to a high-level overview of Python s standard library Several string handling modules were mentioned and a couple of ioStringIO examples were presented One example showed how to write text to a le using either the built-in print() function or a le object s write() method, and how to use an ioStringIO object in place of a real le In previous chapters we handled command-line options by reading sysargv ourselves, but in the coverage of the library s support for command-line programming we introduced the optparse module which greatly simpli es command-line argument handling we will use this module extensively from now on Mention was made of Python s excellent support for numbers, and the library s numeric types and its three modules of mathematical functions, as well as the support for scienti c and engineering mathematics provided by the SciPy project Both library and third-party date/time handling classes were brie y described and examples of how to obtain the current date/time and how to convert between datetimedatetime and the number of seconds since the epoch were shown Also discussed were the additional collection data types and the algorithms for working with ordered sequences that the standard library provides, along with some examples of using the heapq module s functions The modules that support various le encodings (besides character encodings) were discussed, as well as the modules for packing and unpacking the most popular archive formats, and those that have support for audio data An example showing how to use the Base64 encoding to store binary data in py les was given, and also a program to unpack tarballs Considerable support is provided.

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A read of a nal eld of an object within the thread that constructs that object is ordered with respect to the initialization of that eld within the constructor by the usual happens-before rules If the read occurs after the eld is set in the constructor, it sees the value the nal eld is assigned, otherwise it sees the default value

Summary

More precisely, a raw type is de ne to be either: The name of a generic type declaration used without any accompanying actual type parameters Any non-static type member of a raw type R that is not inherited from a superclass or superinterface of R

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Referrals are discussed in detail in 16 The next method of LDAPSearchResults returns an LDAPEntry object The LDAPEntry class contains the following four methods: 1 getDN returns the full distinguished name of the entry as a String (for example, uid=scarter, ou=People, o=airiuscom) 2 getAttribute( String name ) takes a String argument of the attribute name that we are interested in retrieving and returns an object that represents this attribute The return type is LDAPAttribute An optional argument that identi es a language subtype can also be speci ed Language subtypes (part of the LDAP RFC 2596) can be used to store different values for a single attribute in an environment where clients specify the language in which they want to view directory contents Such attributes include a semicolon and the language subtype when they are added to the directory For example:

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