Creating a simple app with flask
--Creating a simple app with flask ← ★ Currently here -Try to create a Home screen -Try to create an authentication function -Try to handle the database -Try to create CRUD function
What is Flask
Flask is a Python micro-framework developed in 2010. It is called a "micro-framework" because it relies on the minimum required libraries and does not require any specific tools or libraries.
It has the following features.
- Very light because it is a micro framework
- I only have the minimum required yesterday, so there is no need for extra features to slow down the operation.
- Highly expandable
- Flask's design philosophy is to create a combination of the minimum required core functions and extended functions.
- ORM, cache, and authentication will need to be added later.
- Highly customizable
- If DB is not always set and you want to use NoSQL, Flask can customize it quite finely.
- Single file framework
- If you use Flask, you only need to install Flask and write a few lines of code in one file to start it in your terminal.
Single file framework
Flask was created with the motivation to be a "single file framework". It also has the greatness of being customizable to any application since it was a minimal yesterday.
Development environment
- mac(catalina)
- Language: Python 3 series
- Framework: Flask
- DB： SQLite
- ORM: SQLAlchemy
We recommend that you do it in a virtual environment.
Deliverables
Directory structure
app/
├ src/
├ templates
├ static
├ manage.py
├ requirements.txt
├ venv
├ server.py
Creating a simple app in flask
Creating a init file
from flask import Flask
app = Flask(__name__)
import src.views
Create views file
from src import app
@app.route('/')
def index():
return "Hello World"
Creating a startup file
import sys
sys.dont_write_bytecode = True
from src import app
if __name__ == '__main__':
host = '127.0.0.1'
port = 5000
app.run(host=host, port=port, debug=True)
This file describes what happens when a request is met at http://127.0.0.1:5000/. *'if name =='main':' describes what happens when this file is run directly. *'Debug = True' launches the application in debug mode and runs it to display various information on the console when the app is run.
Run
$ python3 serve.py
* Running on http://127.0.0.1:5000/ (Press CTRL+C to quit)
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