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Python - Global Variables

In Python, a global variable is a variable that is declared outside of any function and can be accessed by any function in the same module or file. Global variables can be useful for storing values that are needed by multiple functions within the same module or file. In Python, declaring a variable outside of any function is all that's needed to create a global variable: ``` # defining a global variable my_global_var = "Hello World" # Creating a function that utilizes the global variable: def print_global_var():     print(my_global_var) # calling the function print_global_var()  # output: "Hello World" ``` In the example above, `my_global_var` is a global variable that can be accessed by the function `print_global_var()` because it is defined outside of any function. It is also possible to modify the value of a global variable from within a function using the `global` keyword: ``` # defining a global variable my_global_var = "Hello World" # defining a ...

Python - Variable Names

In Python, a variable is a name that represents a value stored in the computer's memory. A variable name is a string of characters that follows certain rules: 1. Variable names can contain letters (both uppercase and lowercase), digits, and underscores (_). They cannot start with a digit. 2. Variable names are case-sensitive, which means that uppercase and lowercase letters are distinct. For example, `myVar` and `myvar` are two different variable names. 3. Variable names cannot be a reserved word in Python. Reserved words are special keywords in Python that have a specific meaning and purpose, such as `if`, `else`, `while`, `for`, `and`, `or`, `not`, etc. 4. Variable names should be descriptive and meaningful, reflecting the purpose of the variable. Avoid using single letters or abbreviations that may be unclear or confusing. 5. Use lowercase letters for variable names, and separate words with underscores to make the name more readable. For example, `my_variable_name`. Here are som...

Cryptocurrency and blockchain technology

Introduction: Cryptocurrency and blockchain technology have taken the world by storm in recent years, with the rise of Bitcoin, Ethereum, and other digital currencies. These technologies are changing the way we think about money and transactions, offering new possibilities for secure, decentralized, and transparent financial systems. In this article, we will explore the basics of cryptocurrency and blockchain technology, their benefits and challenges, and their potential impact on various industries and sectors. Part 1: Cryptocurrency What is cryptocurrency? Cryptocurrency is a digital or virtual currency that uses cryptography to secure and verify transactions and to control the creation of new units. Unlike traditional currencies, which are issued by central banks or governments, cryptocurrencies are decentralized and operate on a peer-to-peer network. This means that there is no central authority or intermediary controlling transactions, and users can transact directly with each oth...

What does it mean to be patriotic in different cultures?

Patriotism, a sense of attachment and commitment to a country, nation or political community. Patriotism (love of country) and nationalism (loyalty to a nation) are often taken as synonymous, yet patriotism originated nearly 2,000 years before the rise of nationalism in the 19th century. Greek and especially Roman antiquity provide the roots of a political patriotism that envisions loyalty to the patria as loyalty to the political concept of the republic. It involves the love of law and general liberty, the pursuit of the common good, and the duty to treat one's country justly. This classical Roman meaning of patria resurfaced in the context of 15th-century Italian city-republics. Here, Patria stands for the general liberties of the city, which can only be secured by the civic spirit of the citizens.  For Niccolò Machiavelli, the love of general liberty enabled citizens to see their private and special interests as part of the common good and helped them resist corruption and tyran...

How do intelligence tests differentiate society?

 Intelligence testing is a hotly-debated topic that often divides opinion. The term "intelligence testing" refers to the concept and practice of assessing individuals' performance on various diagnostic instruments (intelligence tests) in order to predict future behavior and life chances or to identify targets for intervention (eg, educational programs). Additionally, the interchangeability of the terms 'intelligence' and 'IQ' in common parlance creates ambiguity. IQ refers to both a test score and the underlying characteristic (intelligence) intended to explain the score. To begin with, intelligence tests have been around for a long time, with pioneers like Albert Einstein, Isaac Newton, and Thomas Young. It's worth reviewing the sordid, controversial history of IQ testing. Over the past 120 years, intelligence tests, or IQ tests, have greatly influenced society. For example, in the early 1900s, eugenicists used experiments to determine who should be s...

What is blockchain technology and how does it work?

 Over the past few years, you've consistently heard the term 'blockchain technology', perhaps in relation to cryptocurrencies like Bitcoin. In fact, you may be asking yourself, "What is blockchain technology?" It seems that blockchain is a platitude but in a speculative sense, as there is no real meaning that ordinary people can easily understand. It is essential to answer “what is blockchain technology” including the technology used, how it works and how it is becoming important in the digital world. As blockchain continues to grow and become more user-friendly, the onus is on you to learn this evolving technology to prepare for the future. If you are new to blockchain, this is the right platform to gain solid foundational knowledge. In this article, you will learn about "What is Blockchain Technology?" Learn how to answer questions. You'll also learn how blockchain works, why it's important, and how you can use this field to advance your career...

Data analysis with Excel

 To analyze data in Excel, you don't need to be an expert in Excel. You just need to know a few functions and tools to get the job done. Compare with financial analysts, they are very expert in excel and they create financial models and staff. They need to know all the shortcuts, functions, designs, layouts and many of them can work in Excel without touching the mouse. But you don't have to be that level of expert to analyze data with Excel. Before you start working with Excel, first see how many different versions of Excel are available. There are different versions of Excel but Excel 2007(Windows), 2008(MAC), 2010(Windows), 2011 (MAC), Excel 2016, Excel 2019, and Excel 365 are the most popular. Excel 365 is advanced but you can use any version. Let's start with Excel… Excel Layout:   First we need to understand Excel layout. At the very top of Excel, that section is called the "Quick Access Toolbar." By default, that section has three menus Save (Ctrl S), Undo (...

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Python Strings

Python is a computer language that can be used for many things like creating websites, studying data, and building smart machines. Strings are an important way of storing and working with text in Python. This piece of writing will cover the basics of strings, including their definition, how they can be made, and a few typical actions you can do with them. What are Strings in Python? Python considers a string as a series of characters that signify text-based data. Such a string is composed of a group of characters that are enclosed either in single quotes ('') or double quotes (""). Strings can contain letters, numbers, symbols, and spaces, and can be of any length. For instance, "Hello, World!" is a valid string, as are 'Python is awesome!' and "12345". The choice of quotes is yours to make, as long as you're consistent. In Python, if a string begins with a single quote, it must be terminated with a single quote. Similarly, if a string ...

Python - Modify Strings

Python -  Modify Strings Python comes with some ready-to-use tools that make working with text easier. Upper Case Example If you apply the upper() method to a string in Python, it will convert all the letters in the string to uppercase and return the modified string: x =   "Hello, World!" print (x. upper() ) Lower Case Example If you apply the  lower()  method to a string in Python, it will convert all the letters in the string to uppercase and return the modified string: x =  "Hello, World!" print (x.lower()) Remove Whitespace The term "whitespace" refers to the space that appears before and/or after the text itself, and it is often desirable to eliminate this space. Example Using the ` strip()` method, you can eliminate any whitespace located at the start or end of a string : x =  " Hello, World! " print (x.strip())  # returns "Hello, World!" Replace String Example With the ` replace() ` method, you can substitute one string with an...

The most popular niche to get traffic

The most popular niche is a highly debated topic in the world of business and entrepreneurship. However, based on market research and consumer behavior, it can be argued that the tech industry is the most sought after niche today. With the rise of the internet and the increasing demand for technological advancements, it's no surprise that the tech industry has become a leading niche. The tech industry includes a wide range of sub-niches, such as software development, artificial intelligence, machine learning, robotics, cybersecurity, and cloud computing. These sub-niches have gained immense popularity in recent years due to their ability to solve complex problems and improve overall efficiency. One of the reasons why the tech industry has become so popular is due to its ability to disrupt traditional industries. For example, the rise of online shopping has led to the downfall of brick-and-mortar stores. The introduction of mobile payments has replaced traditional banking methods. T...