Following are instructions for installing OpenStack (ocata) on Ubuntu 16.04 LTS VM. When creating Ubuntu VM, the RAM size must be at least 4GB. Otherwise, OpenStack may show errors while installing. Add user named “stack” using the following command: sudo useradd -s /bin/bash -d /opt/stack -m stack Assign no password for […]
In this article we will learn to implement a java program to print all unique words of a string. A java program is provided below which reads a line of text from the user and prints out the unique words in ascending order. We use TreeMap class from collections framework to store the frequency […]
In this article we will learn to implement a Java program to print only unique characters in a string. A Java program is provided below which reads a string from the user, and prints out only the unique characters in the string in insertion order. First we find out the frequency of each character […]
In this article we will learn to implement a Java program to print the frequency of characters in a string. A Java program is provided below reads the string and gives the frequency of each character (number of times a character is repeated). This java program reads a string from the user, calculates frequency […]
In this article we will learn to implement a Java program to remove duplicate characters from a string. A java program is provided below that accepts a string from the user, ignores any duplicate characters and prints each character only once in ascending order. We use TreeSet class from collections framework for printing the characters […]
Welcome to Python Programming Tutorial series created by Startertutorials. This is a comprehensive programming tutorial which covers almost all the core concepts in Python programming language. I hope you will enjoy the tutorial. You can give feedback by commenting below. Python is a multi-paradigm language gaining widespread popularity now-a-days due to its simplicity and expressiveness. […]
In this article we will learn about testing in Python. This covers what is unit testing, how to write and run unit tests in Python programming language. Introduction Testing is the practice of writing code that helps to find if there are any errors in the actual logic of the program. It does not […]
This article provides a comprehensive overview of standard libraries in Python programming language along with example programs. Introduction to Standard Library A library is a set of files which contains pre-defined code that we can use in our own programs. For example in our Python programs we are using print() and input() for printing […]
This article provides a comprehensive overview of exception handling in Python programming language along with example programs. Introduction An error is an abnormal condition that results in unexpected behavior of a program. Common kinds of errors are syntax errors and logical errors. Syntax errors arise due to poor understanding of the language. Logical errors […]
In this article we will learn about inheritance and polymorphism in Python programming language. Both inheritance and polymorphism are defined and examples are provided. Inheritance Creating a new class from existing class is known as inheritance. The class from which features are inherited is known as base class and the class into which features […]