【Flask教程】Flask概述

Flask简介

Flask是一个使用python编写的轻量级“微内核”web应用框架。

如何理解微内核？

the "micro" in microframework means Flask aims to keep the core simple but extensible.

对比Django区别如下：

Flask开发环境搭建

python包管理工具

• eazy_install
• pip（推荐）

⚠️注意：python只能全局安装

• 优点：只需安装一次，在其他项目中都可以使用，避免重复安装。
• 缺点：部分工程使用的python版本不一样。

pip常用命令

• pip install
• pip uninstall
• pip list

mac开发环境搭建

使用pip安装Flask：pip install flask

Flask开发工具

俗话说 “工欲善其事，必先利其器”

常用的纯文本开发工具

• Notepad++
• Sublime
• Emacs
• Vim（推荐）

配置基Vim的python开发环境

• Vundle：Vim管理插件
• YouCompleteMe：强大的自动补全插件
• NERDTree：文件间跳转插件
• Vim-Jinja2-Syntax：语法增强插件

Vundle

安装源：git clone https://github.com/VundleVim/Vundle.vim.git ~/.vim/bundle/Vundle.vim 配置：$vim ~/.vimrc

set nocompatible              " be iMproved, required
filetype off                  " required

" set the runtime path to include Vundle and initialize
set rtp+=~/.vim/bundle/Vundle.vim
call vundle#begin()
" alternatively, pass a path where Vundle should install plugins
"call vundle#begin('~/some/path/here')

" let Vundle manage Vundle, required
Plugin 'VundleVim/Vundle.vim'

" The following are examples of different formats supported.
" Keep Plugin commands between vundle#begin/end.
" plugin on GitHub repo
Plugin 'tpope/vim-fugitive'
" plugin from http://vim-scripts.org/vim/scripts.html
" Plugin 'L9'
" Git plugin not hosted on GitHub
Plugin 'git://git.wincent.com/command-t.git'
" git repos on your local machine (i.e. when working on your own plugin)
Plugin 'file:///home/gmarik/path/to/plugin'
" The sparkup vim script is in a subdirectory of this repo called vim.
" Pass the path to set the runtimepath properly.
Plugin 'rstacruz/sparkup', {'rtp': 'vim/'}
" Install L9 and avoid a Naming conflict if you've already installed a
" different version somewhere else.
" Plugin 'ascenator/L9', {'name': 'newL9'}

" All of your Plugins must be added before the following line
call vundle#end()            " required
filetype plugin indent on    " required
" To ignore plugin indent changes, instead use:
"filetype plugin on
"
" Brief help
" :PluginList       - lists configured plugins
" :PluginInstall    - installs plugins; append `!` to update or just :PluginUpdate
" :PluginSearch foo - searches for foo; append `!` to refresh local cache
" :PluginClean      - confirms removal of unused plugins; append `!` to auto-approve removal
"
" see :h vundle for more details or wiki for FAQ
" Put your non-Plugin stuff after this line

开始插件安装：

编写第一个flask应用

$ vim app.py

from flask import Flask
app = Flask(__name__)

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

if __name__ == '__main__':
    app.run()

$ python hello.py 运行

常用集成开发环境

• Microsoft Visual Studio
• Eclipse + pydev
• Pycharm （推荐）

1、创建一个flask项目 2、实现"Hello world"

from flask import Flask
app = Flask(__name__)

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

if __name__ == '__main__':
    app.run()