Gain insights into developing web applications using Flask, a lightweight and easy-to-learn Python framework. Delve into techniques that make you a sought-after full-stack developer.

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This project-based course is a detailed guide to web application development using the increasingly popular Flask framework.

Flask is known for being simple, lightweight and having a small learning curve. If you've got some experience in Python, picking up Flask will be a breeze. It's got a booming job market and will put you on track to becoming an in-demand full-stack developer. What's not to love?

Flask: Develop Web Applications in Python

# Initial set-up for Flask

To run a `Flask` application on Educative, we do not need to set up anything. All code will run inside the special environment within the browser. **It’s as easy as that!**


Educative is designed in such a way that we do not get distracted by dependencies and get right into what is essential: **the learning**. 

# Writing our first application 

The simplest Flask application can be made using only one script! Let us call this file `app.py`. We will break down the program into steps and discuss one.


## Step 1: Importing modules
For this application, we only need the `Flask` module from the `flask` package. So let's import that first.
```python 3
from flask import Flask
```
## Step 2: Creating a Flask object

We need to make an object with the imported `Flask` module. This object will be our **WSGI** application called `app`. As discussed before, the *WSGI aspect* of the application is taken care of by the `Flask` module.


```python 3
app = Flask(__name__)
``` 

## Step 3: Run the application in main
To run our application, we need to call the `run()` function of our application object.
```python 3
if __name__ == "__main__":
    app.run()
```
The `run()` function has some optional parameters. For complete documentation, refer [here](https://flask.palletsprojects.com/en/2.0.x/api/). 

## Step 4: Create a view function

Before we run the application, we need to tell the application to show something as output in the browser window. Thus, we create a function called `hello()` which returns the string `"Hello World!"`. The output returned from this function will be shown in the browser.  
```python 3
def hello():
    return "Hello World!"; 
```
## Step 5: Assign a URL route
Finally, we need to tell the Flask app when to call the view function `hello()`. For this purpose, we will create a URL route. A URL route is associated with each view function. This association is created by using the `route()` decorator before each view function. 
```python
@app.route("/") 
def hello():
    return "Hello World!"; 
```


# Complete implementation
The following program shows the complete implementation of a "Hello World" application in Flask!

> 📌 **Note:** In the `run()` function below we have specified `debug = True`, `host = "0.0.0.0"` and `port = 3000`. Due to the platform configurations, we will be using these same values for `host` and `port`.

In this lesson, we will build our first Flask application! Hurrah!

Before Getting Started

Introduction to Flask

First Flask Application

Build File/Directory Explorer in Flask

Static Templates

Static Files

Dynamic Templates

Form Handling

Database

Operations on Models

Conclusion

Test a MEAN Stack Todo Application with JEST

Build an E-Learning Website Using Flask

Hello World!

Initial set-up for Flask

Writing our first application

Step 1: