一个简单的flask程序

程序代码(index.py)：

# 导入flask模块
from flask import Flask
# __name__可能是__main__,也可能是导入模块
app = Flask(__name__)
# 定义路由
@app.route('/')
def hello_world():
    # 返回要显示的内容
    return 'hello world!!!'

有了代码如何启动呢？

打开终端程序输入下面内容(终端程序请切换到相应的文件目录):

export FLASK_APP=index.py

flask run

如果是Windows用户：

(myenv) F:\delete\python\flask>set FLASK_APP=index.py

(myenv) F:\delete\python\flask>flask run
 * Serving Flask app "index.py"
 * Environment: production
   WARNING: Do not use the development server in a production environment.
   Use a production WSGI server instead.
 * Debug mode: off
 * Running on http://127.0.0.1:5000/ (Press CTRL+C to quit)
127.0.0.1 - - [18/Jan/2019 09:57:12] "GET /favicon.ico HTTP/1.1" 404 -
127.0.0.1 - - [18/Jan/2019 09:57:12] "GET / HTTP/1.1" 200 -

在浏览器访问对应的接口即可，我这里是：127.0.0.1:5000