Python's interactive mode works on the principle of REPL (Read - Evaluate - Print - Loop). The code module in Python's standard library provides classes nd convenience functions to set up REPL environment from within Python script. Following two classes are defined in code module: InteractiveInterpreter: This class deals with parsing and interpreter state (the user’s namespace) Intera.....

The poolib module from Python's standard library defines POP3 and POP3_SSL classes. POP3 class encapsulates a connection to a POP3 server and implements the protocol as defined in RFC 1939. POP3_SSL classsupports POP3 servers that use SSL as an underlying protocol layer. POP3 protocolis obsolescent as its implementation quality of POP3 servers is quite poor. If your mailserver supports IMAP.....

Python’s sys module provides access to any command-line arguments via the sys.argv. sys.argv is the list of command-line arguments and sys.argv[0] is the program ie. the script name. Save following code as args.py , Execute above script from command line as follows: , The getopt module has funcions toparse the command line arguments in sys.argv. It supports the same conventions as the.....

RSVP is a transport layer protocol that is used to reserve resources in a computer network to get different quality of services (QoS) while accessing Internet applications. It operates over Internet protocol (IP) and initiates resource reservations from the receiver’s end. RSVP is a receiver oriented signalling protocol. The receiver initiates and maintains resource reservation. It is.....

The Matcher can be reset using the java.util.regex.Matcher.reset() method. This method returns the reset Matcher. A program that demonstrates the method Matcher.reset() in Java regular expressions is given as follows:  Live Demo , , Now let us understand the above program. The subsequence “(a*b)” is searched in the string sequence "caaabcccab". Then the find() method is use.....

The offset value after the last character is matched from the sequence according to the regex is returned by the method java.util.regex.Matcher.end(). This method requires no arguments. If no match occurs or if the match operation fails then the IllegalStateException is thrown. A program that demonstrates the method Matcher.end() Java regular expressions is given as follows:  Live Demo.....

The reluctant qualifier starts with the shortest string size as possible. If a match is found by the engine, the process continues to find more matches otherwise the engine adds a character to the searched string section and tries again. This continues until a match is obtained or the string is used up. The regex "B+?" is used to find the match in the string "SkyIsBlue". A program that demo.....

All the words that start with a can be found in a string by using regular expressions in Java. The regular expressions are character sequences that can be used to match other strings using a specific pattern syntax. The regular expressions are available in the java.util.regex package which has many classes but the most important are Pattern class and Matcher class. A program that finds all .....

A thread can be created by implementing the Runnable interface and overriding the run() method. Then a Thread object can be created and the start() method called. The thread priority can be provided to the thread by the JVM or the programmer. It determines when the processor is provided to the thread as well as other resources. The method setPriority() of class Thread can be used to set the.....

The final static field variable is a constant variable. There is only one copy of this variable available. It is mandatory to initialize the final static field variable explicitly as the default value for it is not provided by the JVM. Also, this variable cannot be reinitialized. A program that initializes the final static field variable using a static initialization block is given as follo.....