teleren/devto huggingface dataset:
A Guide to Building a Historical Currency Rates Converter: Step-by-Step Tutorial
Tags: currency, converter
Published: 2024-02-29 09:30:11

Currency exchange rates are constantly changing, making it essential for businesses and individuals to track historical rates for analysis and decision-making. In this tutorial, we will learn how to build a **[historical currency rates converter](https://exchangeratesapi.io/)** using Python. This converter will allow users to retrieve and convert historical currency exchange rates based on their specified date range.

## Step 1: Setting Up Your Python Environment

Before we start coding, make sure you have Python installed on your system. You can download Python from the official website and follow the installation instructions.

Next, we need to install the Forex-Python library, which provides a simple API for fetching exchange rates. Install the library using pip:

![Image description](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/qyn3ks8g6lzti6i4o6ed.png)

## Step 2: Importing the Necessary Libraries

Open your Python editor and start by importing the required libraries:

![Image description](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/mzjut9icjwxyrwud4076.png)

## Step 3: Creating the Currency Converter Class

Next, create a class named HistoricalCurrencyConverter that will handle the conversion of historical currency rates. Define the class and its constructor as follows:

![Image description](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/b434yaipzdod2iiupqsz.png)

## Step 4: Implementing the convert_currency Method

Inside the HistoricalCurrencyConverter class, implement the convert_currency method to fetch historical rates and perform the currency conversion:

![Image description](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/u802vzaobi3ntr1d4suf.png)

## Step 5: Using the Currency Converter

Now, let’s create an instance of the HistoricalCurrencyConverter class and use it to convert currency:

![Image description](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/haj246pz7y7q7cypr4ua.png)

## Step 6: Running the Currency Converter

Save your Python file and run it. You should see the converted amount printed to the console, based on the historical exchange rate for the specified date range.

## Conclusion

In this tutorial, we learned how to build a historical currency rates converter using Python. This converter allows users to retrieve and convert historical currency exchange rates based on their specified date range. You can further enhance this converter by adding error handling, additional currency conversion options, and user interfaces for better usability.
Alpaca image generator website Built with ReactJS
Tags: images, generator, website
Published: 2024-05-15 14:31:31

---
title: Alpaca image generator website Built with ReactJS
published: true
date: 2024-02-29 09:25:52 UTC
tags: Images,Generator,WebSite
canonical_url: https://reactjsexample.com/alpaca-image-generator-website-built-with-reactjs/
---

# Alpaca image generator website
 ![Alpaca image generator website Built with ReactJS](https://reactjsexample.com/content/images/2024/02/Code_2024-02_17-25-42.jpg)

This is an open source project from [DevProjects](https://www.codementor.io/projects/web/alpaca-image-generator-website-ce2oc0eus8). This project is not just about alpacas. Allowing users to generate and download avatars are common in many interactive websites. In this project, I learnt how to create an image generator website that allows users to generate, combine, and download images.

[View Demo](https://alpaca-image-generator-beta.vercel.app/)[View Github](https://github.com/sanjay-ar/ImagiForge)

## Tech/framework used

Built with ReactJS, CSS and Merge Images Library

## Screenshots and demo

![Alpaca image generator website Built with ReactJS](https://user-images.githubusercontent.com/84178696/201708267-3ff9089f-d2e1-4fcb-89e5-d21b7700c49d.png)

## Problems and Thought Process

Like most projects, I ran into a few bumps along the way. One particular one was in rendering the styles buttons from the data file I had setup, as they were from a nested array under the buttons for the features.

The biggest obsatcle I encountered during this project was maintaining the state for all the components throughout the entire React app. This was my first interactive React project that allowed interaction from the user, so I had a tough but rewarding time implementing the state using the useState hook and props to modify the setup file and render the components accordingly.
Reasons to Hire the Best Android App Developer in Chandigarh
Tags: androidappdeveloper, appdevelopmentcompany, wavyinformatics
Published: 2024-02-29 09:22:55

Are you looking for the best Android app developer in Chandigarh to bring your app idea to life? Look no further than Wavy Informatics. Our experienced mobile app developers create high-quality, user-friendly, and innovative apps for a wide range of industries. As a leading app development company in Chandigarh, we offer top-notch mobile app development services that are tailored to meet the unique needs of our clients. By hiring our [Android app developer in Chandigarh](https://wavyinformatics.com/reasons-to-hire-the-best-android-app-developer-in-chandigarh/), you can rest assured that you will receive a cutting-edge app that stands out in the crowded marketplace. Whether you are a startup or an established business, Wavy Informatics is your trusted partner for all your app development needs. Contact us today to learn more about our services and take your business to the next level.
How to automatically change your java SDK using sdkman
Published: 2024-02-29 09:19:28

## What
When managing multiple projects on your machine, you may need to manage multiple versions of java (or other SDKs), and changing this constantly can be a pain.

Using [sdkman](https://sdkman.io/), we can manage this automatically.

## Requirenments
sdkman :)

## How
First of all, we need to enable the `auto_env` function, which will make the exchange happen whenever the directory is accessed via the terminal

To do this, edit the config file inside `~/.sdkman/etc/config` and change the value for `auto_env` to `true`, or, use this command where `$HOME` is your home folder

```
sed -i 's/sdkman_auto_env=false/sdkman_auto_env=true/' "$HOME/.sdkman/etc/config"
```

After this change, access your project folder, select the JDK (eg `sdk use java 8.0.292-open`) and run the command:

```
sdk env init
```

This command will create a file called `.sdkmanrc` which contains the JDK definition for this project.

```
# Enable auto-env through the sdkman_auto_env config
# Add key=value pairs of SDKs to use below
java=8.0.292-open
```
and
```
# Enable auto-env through the sdkman_auto_env config
# Add key=value pairs of SDKs to use below
java=17.0.10-zulu
```

## Result
After running this process, every time you access the folders you will notice the JDK change

```
$ cd my-project/
Using java version 17.0.10-zulu in this shell.
$ cd ../my-project-2
Using java version 8.0.292-open in this shell.
```

## Resources
* [mrhaki](https://blog.mrhaki.com/2020/10/automatic-switching-of-java-versions.html)
* [sdkman blog](https://sdkman.io/usage#:~:text=sdk%20help%20install-,Configuration,-Configuration%20can%20be)
What to Expect in Canadian Immigration in 2024?
Tags: canadavisaconsultancyhyderabad
Published: 2024-02-29 09:16:35

Introduction:
The prospect of immigrating to Canada in 2024 comes with its own set of opportunities and challenges. As we step into the new year, it is crucial for aspiring immigrants to stay informed about the evolving landscape of Canadian immigration.
Trending Topics in 2023:	
Looking back at the preceding year, 2023 marked a turning point in Canadian immigration. Category-based Express Entry draws gained prominence, coinciding with a three-year plan that flattened out immigration levels. However, amidst these changes, public opinion on immigration hit its lowest point since 1998, a factor that may have implications for temporary residents.
Influencing Factors:
Understanding the policies affecting newcomers requires a comprehensive look at global events, Canada’s economic landscape, and the prevailing political climate.
2024: A Year of Changes?
This section will focus on the potential shifts in Canadian immigration policies for 2024. With the housing shortage and rising living costs, there are indications that the number of temporary residents accepted into Canada might be reined in. Insights from Canada’s immigration minister, Marc Miller, suggest forthcoming announcements regarding curbing temporary residence.
Public Opinion and Immigration:
An analysis of the Environics Institute’s report from October 2023 will be explored, highlighting the decline in support for immigration.
Maintaining Targets amid Changes:
While some countries are reducing newcomer numbers, Canada maintains its commitment to welcoming 485,000 new immigrants in 2024, and 500,000 annually from 2025 to 2026.
Humanitarian Efforts:
Highlighting Canada’s commitment to humanitarian efforts, the article will explore initiatives like offering temporary residence to those affected by global conflicts, such as the Israel-Hamas war in the Gaza Strip. Balancing humanitarian goals with immigration targets is a delicate task for the government.
International Experience Canada (IEC) Program:
For those dreaming of a working holiday in Canada, the IEC program is a key highlight for 2024.
Express Entry vs. Provincial Nominee Program (PNP):
A comparative analysis of two major pathways to permanent residence, Express Entry and PNP, will be presented. The Canada pr eligibility criteria, processing times, and considerations for individuals to make informed choices based on their unique profiles.
Quebec Immigration:
Acknowledging that Quebec follows its own immigration programs, here will provide an overview of the Quebec Experience Program and Quebec Skilled Worker Program, emphasizing how they differ from the federal Express Entry and PNP.
Conclusion:
As the new year unfolds, staying informed about the dynamics of Canadian immigration is paramount. This article aims to guide prospective immigrants through the anticipated trends, challenges, and opportunities that will define the Canadian immigration landscape in 2024. Whether considering Express Entry, PNP, or other programs, knowledge and preparedness will be key to a successful immigration journey.
Context of distributed databases
Tags: webdev, javascript, programming, react
Published: 2024-02-29 09:15:49

Certainly! Let's explore these concepts in the context of distributed databases:

### 1. Distributed Databases:

A distributed database is a database that consists of two or more interconnected databases that are physically distributed over different locations and connected by a network. This architecture provides advantages such as improved performance, fault tolerance, and scalability. Here's a brief example using a distributed architecture:

```plaintext
- Node 1 (Location A):
  - Database Shard 1

- Node 2 (Location B):
  - Database Shard 2

- Node 3 (Location C):
  - Database Shard 3

- Each node manages a shard of the overall data, and the system operates as a cohesive, distributed database.
```

### 2. Polyglot Persistence:

Polyglot Persistence refers to the practice of using multiple data storage technologies within a single application to best match the requirements of different data sets. Each type of data is stored using the most suitable database technology. Here's a brief example:

```plaintext
- Relational Database (MySQL):
  - Used for storing structured data related to user profiles.

- Document-Oriented Database (MongoDB):
  - Utilized for handling semi-structured or unstructured data, such as user comments and product reviews.

- Graph Database (Neo4j):
  - Employed for managing relationships and social network connections among users.
```

Polyglot Persistence allows developers to choose the most appropriate database for each specific use case within an application.

### 3. Data Partitioning:

Data partitioning involves dividing a large database into smaller, more manageable pieces called partitions or shards. This practice is crucial for achieving horizontal scalability and improving performance. Here's a simplified example using data partitioning:

```plaintext
- Original Table (Orders):
  - OrderID | CustomerID | Product | OrderDate
  - 1       | 101        | Laptop  | 2024-03-01
  - 2       | 102        | Monitor | 2024-03-02
  - ...

- Partitioned Tables:
  - Orders_Partition_1 (OrderID, CustomerID)
  - Orders_Partition_2 (OrderID, CustomerID)
  - ...

- Each partition holds a subset of the data, and the system can distribute these partitions across multiple nodes for parallel processing and improved performance.
```

In the context of distributed databases, data partitioning is often employed to distribute the workload and enhance scalability.
Manual Testing
Published: 2024-02-29 09:15:46

Manual testing is the process of manually executing test cases without the use of external testing tools or scripts. In manual testing, testers execute test cases step by step to identify defects, and ensure that the software functions correctly, and meets its requirements.

* Testers follow predefined test cases and execute them manually, step by step, to verify the behavior of the software application.

* Manual testing often involves assessing the user experience, including usability, accessibility, and overall user satisfaction.

* Testers document their test results, including defects found, steps performed, and any other relevant information to developers and product owners.

* Manual testing also involves regression testing, where testers retest the software after modifications to ensure that existing functionalities have not been affected.


**Manual testing Benefits:**

* Manual testing doesn't require extensive setup or scripting, making it easy to start testing immediately. Testers can quickly adapt to changing requirements and perform testing as needed.

* Manual testing can be more cost-effective for small projects or projects with frequently changing requirements. Setting up and maintaining automated tests can be time-consuming and expensive, making manual testing a more practical option for some scenarios.

*Manual testers can apply their creativity, and domain knowledge to uncover complex defects that automated tests might miss.


**Manual testing Drawbacks:**

* Manual testing can be time-consuming, especially for repetitive tasks. Testers must execute test cases step by step, which can slow down the testing process and increase the time to release the software.

* Manual testing may not be suitable for large-scale or complex projects due to its reliance on manual effort. As the size and complexity of the project increase, the time and resources required for manual testing also increase significantly, making it impractical compared to automated testing.

* Manual testing may not scale well to accommodate growing testing needs or frequent software updates. As the software evolves, manual testers may struggle to keep up with the demand for testing, leading to delays in the testing process.
Bitcoin mixers
Published: 2024-02-29 09:15:11

- Bitcoin tumblers: These services allow users to mix their bitcoins with other users' bitcoins in order to increase privacy and anonymity. By [mixing the transactions](https://cryptomixers-reviews.org/?page_id=78), it becomes difficult to trace the origin and destination of the bitcoins, providing a higher level of security for users.
- Cryptocurrency blenders: These platforms offer a way for individuals to blend their bitcoin transactions with others, making it harder to track the flow of funds. By mixing the coins, the original source and destination of the bitcoins become obfuscated, enhancing privacy and preventing potential surveillance.
- Digital currency mixers: These tools enable users to mix their bitcoin transactions with others, creating a more complex and convoluted transaction history. By doing so, it becomes challenging for anyone to trace the origin and destination of the bitcoins, ensuring a higher level of privacy and security for users.
How Anonymous is Bitcoin?
Published: 2024-02-29 09:13:22

- The level of anonymity provided by Bitcoin has been a subject of debate and scrutiny within the cryptocurrency community.
- [Bitcoin](https://bitcoin.org/en/) transactions are recorded on a public ledger called the blockchain, which means that anyone can view the transaction history and trace the flow of funds.
- However, Bitcoin addresses are not directly linked to personal identities, providing a certain level of pseudonymity. Users can create multiple addresses to enhance privacy, making it difficult to associate transactions with specific individuals.
![Image description](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/6gc34iuglthmjwq2iqh0.jpeg)
NoSQL database
Tags: webdev, javascript, beginners, programming
Published: 2024-02-29 09:13:05

Certainly! Let's provide a short example for both a relational database (using SQL) and a non-relational database (using MongoDB, a document-oriented NoSQL database).

### Relational Database (SQL - PostgreSQL):

Suppose we have two tables: `users` and `orders`. The following SQL query retrieves the names of users who made an order after a certain date.

```sql
SELECT users.name
FROM users
JOIN orders ON users.user_id = orders.user_id
WHERE orders.order_date > '2024-01-01';
```

### Non-Relational Database (MongoDB - NoSQL):

In MongoDB, suppose we have a collection called `customers`, and each document represents a customer with their orders as an embedded array. The following query retrieves customers who made a purchase after a certain date.

```javascript
db.customers.find({
  "orders.orderDate": { $gt: ISODate("2024-01-01T00:00:00Z") }
}, {
  "name": 1,
  "_id": 0
});
```

In this MongoDB example, we're using the `$gt` (greater than) operator to query based on the order date within the embedded array.

These examples illustrate the difference in query syntax and data modeling between relational and non-relational databases. In a relational database, data is often normalized into separate tables, and JOIN operations are used to combine related data. In a non-relational database, data may be denormalized and stored together in documents, with queries designed to navigate and filter within these documents.
Hypothetical e-commerce database
Tags: webdev, javascript, beginners, programming
Published: 2024-02-29 09:12:07

Certainly! Let's provide examples for each of the concepts you mentioned using a hypothetical e-commerce database scenario.

### 1. Normalization and Denormalization:

**Normalization:**
```sql
-- Normalized tables
CREATE TABLE Customers (
    customer_id INT PRIMARY KEY,
    customer_name VARCHAR(255),
    -- Other customer-related fields
);

CREATE TABLE Orders (
    order_id INT PRIMARY KEY,
    customer_id INT,
    order_date DATE,
    -- Other order-related fields
    FOREIGN KEY (customer_id) REFERENCES Customers(customer_id)
);

-- This is a normalized structure where customer information is in a separate table.
```

**Denormalization:**
```sql
-- Denormalized table
CREATE TABLE DenormalizedOrders (
    order_id INT PRIMARY KEY,
    customer_name VARCHAR(255),
    order_date DATE,
    -- Other denormalized order-related fields
);

-- In this denormalized structure, customer information is duplicated within the Orders table for better query performance.
```

### 2. Query Optimization:

```sql
-- Example of query optimization using indexing
CREATE INDEX idx_orders_customer_id ON Orders(customer_id);

-- This index improves the performance of queries that involve filtering or sorting by the customer_id column.
```

### 3. Transaction Management:

```sql
-- Example of transaction management
BEGIN TRANSACTION;

-- Update the order status
UPDATE Orders SET status = 'Shipped' WHERE order_id = 123;

-- Deduct the product quantity from inventory
UPDATE Products SET quantity = quantity - 1 WHERE product_id = 456;

-- If both updates succeed, commit the transaction
COMMIT;

-- If any update fails, roll back the entire transaction
ROLLBACK;
```

### 4. Database Security:

```sql
-- Example of role-based access control
CREATE ROLE Customer;
CREATE ROLE Admin;

-- Grant privileges to roles
GRANT SELECT, INSERT, UPDATE, DELETE ON Orders TO Customer;
GRANT ALL PRIVILEGES ON Orders TO Admin;

-- Assign roles to users
CREATE USER alice WITH PASSWORD 'password';
GRANT Customer TO alice;
```

### 5. Stored Procedures and Triggers:

```sql
-- Example of a stored procedure
CREATE PROCEDURE UpdateOrderStatus(IN order_id INT, IN new_status VARCHAR(50))
BEGIN
    UPDATE Orders SET status = new_status WHERE order_id = order_id;
END;

-- Example of a trigger
CREATE TRIGGER Before_Order_Insert
BEFORE INSERT ON Orders
FOR EACH ROW
SET NEW.order_date = NOW();

-- The trigger automatically sets the order_date to the current timestamp before inserting a new order.
```

These examples showcase how these concepts are implemented in SQL for a simplified e-commerce database. Keep in mind that the specifics may vary based on the actual database management system you are using (e.g., MySQL, PostgreSQL, etc.).