what is python flask

Flask is a lightweight web application framework written in Python. Its WSGI toolbox uses Werkzeug and its template engine uses Jinja2. Flask is licensed under BSD.

Flask is also called a "microframework" because it uses a simple core and uses extensions to add other features. Flask does not have a default database or form validation tool.

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However, Flask retains the flexibility of expansion, and you can use Flask-extension to add these functions:

ORM, form validation tools, file uploads, various open authentication technologies. The latest version is 1.0.2

Flask is simple and easy to learn. Here is the Flask version of hello world(hello.py):

from flask import Flask
app = Flask(__name__)
@app.route("/")
def hello():    
    return "Hello World!"
 
if __name__ == "__main__":
    app.run()

Install flask and you can run it:

$ pip install Flask
 
$ python
hello.py* Running on http://localhost:5000/
 
*flask默认端口是5000

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