sanic是一款用 python3.5+ 写的 web framework，用法和 flask 类似，特点是非常快 。
Github 官网：https://github.com/channelcat/sanic
速度比较
框架实现基础每秒请求数平均时间
SanicPython 3.5 + uvloop30,6013.23ms
Wheezygunicorn + meinheld20,2444.94ms
Falcongunicorn + meinheld18,9725.27ms
Bottlegunicorn + meinheld13,5967.36ms
Flaskgunicorn + meinheld4,98820.08ms
KyoukaiPython 3.5 + uvloop3,88927.44ms
AiohttpPython 3.5 + uvloop2,97933.42ms
安装
环境：python3.5+
python -m pip install sanic
Hello World
创建文件main.py，写入下面的内容
from sanic import Sanic
from sanic.response import json
app = Sanic(__name__)
@app.route('/')
async def test(request):
return json({ 'hello': 'world' })
app.run(host='0.0.0.0', port=8000)
运行 python3 main.py
sanic是不是看起来和flask一样
Request
属性
request.files (dictionary of File objects) - 上传文件列表
request.json (any) - json数据
request.args (dict) - get数据
request.form (dict) - post表单数据
例子
from sanic import Sanic
from sanic.response import json
@app.route('/json')
def post_json(request):
return json({ 'received': True, 'message': request.json })
@app.route('/form')
def post_json(request):
return json({ 'received': True, 'form_data': request.form, 'test': request.form.get('test') })
@app.route('/files')
def post_json(request):
test_file = request.files.get('test')
file_parameters = {
'body': test_file.body,
'name': test_file.name,
'type': test_file.type,
}
return json({ 'received': True, 'file_names': request.files.keys(), 'test_file_parameters': file_parameters })
@app.route('/query_string')
def query_string(request):
return json({ 'parsed': True, 'args': request.args, 'url': request.url, 'query_string': request.query_string })
路由
和flask差不多，一看就懂
from sanic import Sanic
from sanic.response import text
@app.route('/tag/')
async def person_handler(request, tag):
return text('Tag - {}'.format(tag))
@app.route('/number/')
async def person_handler(request, integer_arg):
return text('Integer - {}'.format(integer_arg))
@app.route('/number/')
async def person_handler(request, number_arg):
return text('Number - {}'.format(number))
@app.route('/person/')
async def person_handler(request, name):
return text('Person - {}'.format(name))
@app.route('/folder/')
async def folder_handler(request, folder_id):
return text('Folder - {}'.format(folder_id))
注册中间件
app = Sanic(__name__)
@app.middleware
async def halt_request(request):
print('I am a spy')
@app.middleware('request')
async def halt_request(request):
return text('I halted the request')
@app.middleware('response')
async def halt_response(request, response):
return text('I halted the response')
@app.route('/')
async def handler(request):
return text('I would like to speak now please')
app.run(host='0.0.0.0', port=8000)
异常处理
抛出异常
from sanic import Sanic
from sanic.exceptions import ServerError
@app.route('/killme')
def i_am_ready_to_die(request):
raise ServerError('Something bad happened')
处理异常
from sanic import Sanic
from sanic.response import text
from sanic.exceptions import NotFound
@app.exception(NotFound)
def ignore_404s(request, exception):
return text('Yep, I totally found the page: {}'.format(request.url))
蓝图
和flask中的蓝图一样，用于组织项目结构
创建一个蓝图，相当于创建一个sanic app,上面的用法和上面相同，把app改成蓝图名称bp
from sanic.response import json
from sanic import Blueprint
bp = Blueprint('my_blueprint')
@bp.route('/')
async def bp_root():
return json({'my': 'blueprint'})
蓝图注册到主app
from sanic import Sanic
from my_blueprint import bp
app = Sanic(__name__)
app.register_blueprint(bp)
app.run(host='0.0.0.0', port=8000, debug=True)
总结
sanic将是一个非常流行的框架．因为它基于python3.5+，使用了许多新的特性，这些特性让程序速度更快。
作者：Prasanta
