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Preview — Python Phrasebook by Brad Dayley. Python Phrasebook Brad Dayley Essential Code and Commands Python Phrasebook gives you the code phrases you need to quickly and effectively complete your programming projects in Python. Concise and Accessible Easy to carry and easy to use-lets you ditch all those bulky books for one portable guide Flexible and Functional Packed with more than customizable code snippet Python Phrasebook Brad Dayley Essential Code and Commands Python Phrasebook gives you the code phrases you need to quickly and effectively complete your programming projects in Python.
Concise and Accessible Easy to carry and easy to use-lets you ditch all those bulky books for one portable guide Flexible and Functional Packed with more than customizable code snippets-so you can readily code functional Python in just about any situation Brad Dayley is a software engineer at Novell, Inc.
He has been a system administrator and software developer on the Unix, Windows, Linux, and NetWare platforms for the past 14 years. Brad co-developed an advanced debugging course used to train engineers and customers and is the co-author of several Novell Press books. Get A Copy.
Paperback , pages. Published November 16th by Sams Publishing first published More Details Original Title. Other Editions 3. Friend Reviews. To see what your friends thought of this book, please sign up. To ask other readers questions about Python Phrasebook , please sign up. Lists with This Book. This book is not yet featured on Listopia. Community Reviews. Showing Rating details. More filters. Sort order. Sep 11, TK Keanini rated it it was amazing Shelves: programming-languages. There is a quote mistakenly attributed to Mark Twain which say something like "I would have written a shorter letter, but I did not have the time".
The quote is really from Pascal and it is butchered but that is beside the point. This book on Python is quite simply the shortest and most concise work on the topic to date. It is like getting just enough of the cookbooks and reference books and boiling it down to just enough to fit in your back pocket. Authoring this puppy must have been painful bu There is a quote mistakenly attributed to Mark Twain which say something like "I would have written a shorter letter, but I did not have the time".
Java (programming language) - Wikipedia
Authoring this puppy must have been painful but I do appreciate it. This book is essentially a collection of code snippets that includes a brief discussion and example to support each. I have found a few things to be wrong, either because they are typos or because the version of Python used is 2. Mar 06, Troy rated it really liked it.
Whether you are just starting to learn python or are a seasoned programmer this is a great reference book. However, the overhead of interpreting bytecode into machine instructions made interpreted programs almost always run more slowly than native executables. Just-in-time JIT compilers that compile byte-codes to machine code during runtime were introduced from an early stage.
Java itself is platform-independent and is adapted to the particular platform it is to run on by a Java virtual machine for it, which translates the Java bytecode into the platform's machine language. Some platforms offer direct hardware support for Java; there are micro controllers that can run Java bytecode in hardware instead of a software Java virtual machine,  and some ARM -based processors could have hardware support for executing Java bytecode through their Jazelle option, though support has mostly been dropped in current implementations of ARM.
Java uses an automatic garbage collector to manage memory in the object lifecycle. The programmer determines when objects are created, and the Java runtime is responsible for recovering the memory once objects are no longer in use.
Accessing Java Classes or Libraries from an Application
Once no references to an object remain, the unreachable memory becomes eligible to be freed automatically by the garbage collector. Something similar to a memory leak may still occur if a programmer's code holds a reference to an object that is no longer needed, typically when objects that are no longer needed are stored in containers that are still in use.
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If methods for a non-existent object are called, a null pointer exception is thrown. One of the ideas behind Java's automatic memory management model is that programmers can be spared the burden of having to perform manual memory management. In some languages, memory for the creation of objects is implicitly allocated on the stack or explicitly allocated and deallocated from the heap. In the latter case, the responsibility of managing memory resides with the programmer.
If the program does not deallocate an object, a memory leak occurs. If the program attempts to access or deallocate memory that has already been deallocated, the result is undefined and difficult to predict, and the program is likely to become unstable or crash. This can be partially remedied by the use of smart pointers , but these add overhead and complexity. Note that garbage collection does not prevent logical memory leaks, i. Garbage collection may happen at any time. Ideally, it will occur when a program is idle.
It is guaranteed to be triggered if there is insufficient free memory on the heap to allocate a new object; this can cause a program to stall momentarily. Explicit memory management is not possible in Java. This allows the garbage collector to relocate referenced objects and ensures type safety and security. This was a conscious decision by Java's designers for performance reasons. Java contains multiple types of garbage collectors.
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By default, HotSpot uses the parallel scavenge garbage collector. Having solved the memory management problem does not relieve the programmer of the burden of handling properly other kind of resources, like network or database connections, file handles, etc. Paradoxically, the presence of a garbage collector has faded the necessity of having an explicit destructor method in the classes, thus rendering the management of these other resources more difficult.
The Javadoc style of commenting allows the user to run the Javadoc executable to create documentation for the program and can be read by some integrated development environments IDEs such as Eclipse to allow developers to access documentation within the IDE.
The traditional Hello world program can be written in Java as: . Source files must be named after the public class they contain, appending the suffix. It must first be compiled into bytecode, using a Java compiler , producing a file named HelloWorldApp. Only then can it be executed, or launched. The Java source file may only contain one public class, but it can contain multiple classes with a non-public access modifier and any number of public inner classes. When the source file contains multiple classes, it is necessary to make one class introduced by the class keyword public preceded by the public keyword and name the source file with that public class name.
A class that is not declared public may be stored in any. The compiler will generate a class file for each class defined in the source file. The name of the class file is the name of the class, with. The keyword public denotes that a method can be called from code in other classes, or that a class may be used by classes outside the class hierarchy.
The class hierarchy is related to the name of the directory in which the. This is called an access level modifier. Other access level modifiers include the keywords private and protected. The keyword static  in front of a method indicates a static method , which is associated only with the class and not with any specific instance of that class. Only static methods can be invoked without a reference to an object.
Static methods cannot access any class members that are not also static.
Adding Java-Specific Behavior to Projects
Methods that are not designated static are instance methods and require a specific instance of a class to operate. The keyword void indicates that the main method does not return any value to the caller. If a Java program is to exit with an error code, it must call System. The method name main is not a keyword in the Java language.