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SAX is a standard interface for event-driven XML parsing. Parsing XML with SAX generally requires you to create your own ContentHandler by subclassing xml.sax.ContentHandler.Your ContentHandler handles the particular tags and attributes of your flavor(s) of XML. A ContentHandler object provides methods to handle various parsing events. Its owning parser calls ContentHandler methods as it parses the XML file.The methods startDocument and endDocument are called at the start and the end of the XML file. The method characters(text) is passed character data of the XML file via the parameter text.The ContentHandler is called at the start and end of each element. If the parser is not in namespace mode, ... Read More
Single threaded processes contain the execution of instructions in a single sequence. In other words, one command is processes at a time.The opposite of single threaded processes are multithreaded processes. These processes allow the execution of multiple parts of a program at the same time. These are lightweight processes available within the process.Multithreaded Processes ImplementationMultithreaded processes can be implemented as user-level threads or kernel-level threads. Details about these are provided using the following diagram −User-level ThreadsThe user-level threads are implemented by users and the kernel is not aware of the existence of these threads. It handles them as if they ... Read More
Priority inversion is a operating system scenario in which a higher priority process is preempted by a lower priority process. This implies the inversion of the priorities of the two processes.Problems due to Priority InversionSome of the problems that occur due to priority inversion are given as follows −A system malfunction may occur if a high priority process is not provided the required resources.Priority inversion may also lead to implementation of corrective measures. These may include the resetting of the entire system.The performance of the system can be reduces due to priority inversion. This may happen because it is imperative ... Read More
Multithreaded programs allow the execution of multiple parts of a program at the same time. These parts are known as threads and are lightweight processes available within the process.Threads improve the application performance using parallelism. They share information like data segment, code segment files etc. with their peer threads while they contain their own registers, stack, counter etc.Some of the issues with multithreaded programs are as follows −Let us see them one by one −Increased Complexity − Multithreaded processes are quite complicated. Coding for these can only be handled by expert programmers.Complications due to Concurrency − It is difficult to ... Read More
The Queue module allows you to create a new queue object that can hold a specific number of items. There are following methods to control the Queue −get() − The get() removes and returns an item from the queue.put() − The put adds item to a queue.qsize() − The qsize() returns the number of items that are currently in the queue.empty() − The empty( ) returns True if queue is empty; otherwise, False.full() − the full() returns True if queue is full; otherwise, False.Example#!/usr/bin/python import Queue import threading import time exitFlag = 0 class myThread (threading.Thread): def __init__(self, threadID, name, q): ... Read More
The margin-top specifies the top margin of an element. It can have a value in length, % or auto.ExampleYou can try to run the following code to set the top margin This is a paragraph with a specified top margin This is another paragraph with a specified top margin in percent
The border-bottom-color property changes the color of the bottom border.ExampleYou can try to run the following code to implement the border-bottom-color property: p.demo { border:3px solid; border-bottom-color:#FF0000; } Example showing border top color property
The border-width property changes the color of the right border.ExampleYou can try to run the following code to implement the border-width property: Example showing border width and style
The border-right-style property changes the style of right border. You can try to run the following code to implement border-right-style property:Example Example showing right border
The threading module provided with Python includes a simple-to-implement locking mechanism that allows you to synchronize threads. A new lock is created by calling the Lock() method, which returns the new lock.The acquire(blocking) method of the new lock object is used to force threads to run synchronously. The optional blocking parameter enables you to control whether the thread waits to acquire the lock.If blocking is set to 0, the thread returns immediately with a 0 value if the lock cannot be acquired and with a 1 if the lock was acquired. If blocking is set to 1, the thread blocks and wait for the lock to be released.The release() method ... Read More