Purpose of linecache module in Python’s standard library is to facilitate random access to any text file, although this module is extensively used by Python’s traceback module to generate error trace stack. Further prettyprints of reading are held in a cache so that it saves time while reading lines repeatedly.The most important function in this module is getline() which reads a specified line number from given file. Following is the list of functions −getline(file, x)This function returns xth line from file. If not present it will return empty string. If the file is not present in current path, function ties ... Read More

To check whether the entered value is ASCII 7-bit numeric, check the character from ‘0’ to ‘9’.Here, we have a numeric character.char one = '9';Now, we have checked a condition with if-else for numeric character from ‘0’ to ‘9’if (c >= '0' && c = '0' && c = '0' && c = '0' && c

Python’s built-in open() function opens one file in read/write mode and read/write operations on it. To perform processing on multiple files in a batch, one has to use fileinput module of Python’s standard library. This module provides a Fileinput class with functionality of iterating over files. The module also defines helper functions for the same purpose.Primary interface to this module is input() function. This function returns instance of Fileinput class.fileinput.input(files, inplace, mode)The files parameter is name of one or more files to be read one by one. Each file acts as a generator and using a for loop it can ... Read More

To check whether the entered value is ASCII 7-bit numeric and character (alphanumeric), check the characters ASCII value for −A to Z Or a to z Or 0 to 9Here, we have the following value −char one = '5';Now, we have checked some conditions with if-else for ASCII 7-bit numeric and character.if ((one >= 'A' && one = 'a' && one = '0' && one = 'A' && one = 'a' && one = '0' && one = 'A' && one = 'a' && one = '0' && one

The pathlib module provides an object oriented approach to handling filesystem paths. The module also provides functionality appropriate for various operating systems. Classes defined in this module are of two types – pure path types and concrete path types. While pure paths can only perform purely computational operations, concrete paths are capable of doing I/O operations too.pathlib module defines following classes −Sr.No.Module & Description1PurePathThe base class for all other classes2Pathsubclassed from PurePath. This is a concrete class that represents filesystem path.3PosixPathPath subclass for non-Windows OS4WindowsPathPath subclass for Windows systems5PurePosixPathPurePath subclass for non-Windows systems6PureWindowsPathPurePath subclass for Windows systemsWhen instance of Path ... Read More

Python Object Persistence  The shelve module in Python's standard library is a simple yet effective tool for persistent data storage when using a relational database solution is not required. The shelf object defined in this module is a dictionary-like object persistently stored in a disk file. This creates a file similar to dbm database on UNIX-like systems. The only string data type can be used as a key in this special dictionary object, whereas any pickable object can serve as value. The shelve module defines three classes as follows − ... Read More

In this article, we will learn to subtract the week from the current date using Java. This is useful when you need to manipulate dates, such as calculating dates from previous weeks for scheduling or tracking purposes. We'll use two approaches: using the Calendar class and the LocalDate class, showcasing how to easily adjust dates. Problem Statement Write a program in Java to subtract a specified number of weeks from the current date and display the updated date − Input Run the program Output Current Date = Mon Nov 04 09:41:18 IST 2024 Updated Date = Mon Oct 21 09:41:18 ... Read More

All distinct elements of an array are printed i.e. all the elements in the array are printed only once and duplicate elements are not printed. An example of this is given as follows.Array = 1 5 9 1 4 9 6 5 9 7 Distinct elements of above array = 1 5 9 4 6 7A program that demonstrates this is given as follows.Example Live Demopublic class Example {    public static void main (String[] args) {       int arr[] = {1, 5, 9, 1, 4, 9, 6, 5, 9, 7};       int n = arr.length;   ... Read More

The array is cyclically rotated clockwise by one. This means that each of the array elements are displayed to the right by one and the last element ends up as the first element. An example of this is given as follows.Original array = 1 2 3 4 5 6 7 8 9 10 Rotated array = 10 1 2 3 4 5 6 7 8 9A program that demonstrates this is given as follows.Example Live Demopublic class Example {    public static void main(String[] args) {       int[] arr = {1, 2, 3, 4, 5, 6, 7, 8, 9, ... Read More

Use the replaceFirst() method to replace only first occurrences of given String with new one.Let’s say we have the following string.String str = "THIS IS DEMO TEXT!";We have to replace the first occurrence of “IS” with “EV”. For that, use replaceFirst() method.str.replaceFirst("IS", "EV");The following is the final example, wherein the first occurrence of “IS” is replaced.Example Live Demopublic class Demo {    public static void main(String[] args) {       String str = "THIS IS DEMO TEXT!";       System.out.println("String = "+str);       System.out.println("Replacing only the first occurrence of substring IS...");       System.out.println("Updated string = ... Read More