Flask Note 1

想要來寫個Flask筆記, 這個系列會把一些看到, 或是曾經使用過的技術給記錄下來

環境需求：python2.7以上, python套件pip & virtualenv安裝

0. 建立virtualenv環境, 使用virturlenv目的就是為了建立一個乾淨的開發環境, 可以去掌握你撰寫的python程式跟其他package的相依性, 利於你的程式部署到其他機器上

$ pip install virtualenv
Requirement already satisfied (use --upgrade to upgrade): virtualenv in /Library/Python/2.7/site-packages
Cleaning up...
$ virtualenv .env
New python executable in .env/bin/python
Installing Setuptools..............................................................................................................................................................................................................................done.
Installing Pip.....................................................................................................................................................................................................................................................................................................................................done.
$ source .env/bin/activate #進入virtualenv環境
(.env) $

1. 在virtual environment 下安裝 Flask

$ virtualenv .env
(.env) $ pip install flask

2. 產生app instance

from flask import Flask
app = Flask(__name__)

3. 建立Route

from flask import Flask
app = Flask(__name__) 

@app.route('/')
def index():
    return 'Hello World !!!'

@app.route('/user/<name>/')
def user(name):
    return 'hello %s' % name

if __name__ == '__main__':
    app.run(debug=True);

4. run script by python interpreter

$(.env) python hello.py
*Running on http://127.0.0.1:5000/
*Restarting with reloader

接下來可以打開瀏覽器輸入http://127.0.0.1:5000/看看
還有http://127.0.0.1:5000/user/test
       http://127.0.0.1:5000/user/world