Flask Web开发：HelloWorld（一）

2021-08-24 127 阅读1分钟

安装 flask

$ pip install flask

查看flask版本

$ flask --version

终端输出：

Flask 1.0.2
Python 3.6.5 (v3.6.5:f59c0932b4, Mar 28 2018, 05:52:31)
[GCC 4.2.1 Compatible Apple LLVM 6.0 (clang-600.0.57)]

创建项目目录

$ mkdir flask_web && cd flask_web

创建 hello.py

from flask import Flask

app = Flask(__name__)


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

运行

$ export FLASK_APP=hello.py
$ flask run

终端输出：

peng@localhost flask_web % export FLASK_APP=hello.py
peng@localhost flask_web % flask run
 * Serving Flask app "hello.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)

浏览器打开 http://127.0.0.1:5000/，页面输出：

Hello, World!

设置外部访问（网络中其他电脑可访问）

$ flask run --host=0.0.0.0

开启调试模式

$ export FLASK_ENV=development
$ flask run

终端输出：

peng@localhost flask_web % export FLASK_ENV=development
peng@localhost flask_web % flask run
 * Serving Flask app "hello.py" (lazy loading)
 * Environment: development
 * Debug mode: on
 * Running on http://127.0.0.1:5000/ (Press CTRL+C to quit)
 * Restarting with stat
 * Debugger is active!
 * Debugger PIN: 186-277-807