[flask tutorial] flask overview

Flask brief introduction

Flask It's a use python Written lightweight “ Microkernel ”web Application framework .

How to understand microkernel ？

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

contrast Django The difference between the following ：

Flask Development environment construction

python Package management tools

• eazy_install
• pip（ recommend ）

️ Be careful ：python Global installation only

• advantage ： Just install it once , It can be used in other projects , Avoid re installation .
• shortcoming ： Used in part of the project python The versions are different .

pip Common commands

• pip install
• pip uninstall
• pip list

mac Development environment construction

Use pip install Flask：pip install flask

Flask development tool

It is said that “ A good workman does his work well , You must sharpen your tools first ”

Common plain text development tools

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

Configuration base Vim Of python development environment

• Vundle：Vim Management plug-in
• YouCompleteMe： Powerful auto completion plug-ins
• NERDTree： Inter file jump plug-in
• Vim-Jinja2-Syntax： Syntax enhancement plug-in

Vundle

Install source ：git clone https://github.com/VundleVim/Vundle.vim.git ~/.vim/bundle/Vundle.vim
To configure ：$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

Start plug-in installation ：

Write the first flask application

$ 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 function

Common integrated development environments

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

1、 Create a flask project

2、 Realization "Hello world"

from flask import Flask
app = Flask(__name__)

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

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