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Flask是一個(gè)輕量級(jí)的Python Web框架,它允許開(kāi)發(fā)者快速地構(gòu)建Web應(yīng)用程序,在Flask中,視圖函數(shù)是處理用戶(hù)請(qǐng)求并返回響應(yīng)的核心部分,為了提高性能,F(xiàn)lask提供了異步視圖功能,允許開(kāi)發(fā)者使用異步I/O操作來(lái)處理請(qǐng)求和響應(yīng)。

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要使用異步視圖功能,首先需要安裝帶有async額外功能的Flask,以下是詳細(xì)的技術(shù)教學(xué):
1、安裝Flask
在開(kāi)始之前,確保已經(jīng)安裝了Python,使用pip命令安裝Flask:
pip install Flask
2、安裝支持異步的Flask擴(kuò)展
為了使用異步視圖功能,需要安裝支持異步的Flask擴(kuò)展,可以使用以下命令安裝:
pip install FlaskSocketIO
3、創(chuàng)建一個(gè)簡(jiǎn)單的Flask應(yīng)用
創(chuàng)建一個(gè)名為app.py的文件,并在其中編寫(xiě)以下代碼:
from flask import Flask, render_template
import asyncio
app = Flask(__name__)
@app.route('/')
def index():
return render_template('index.html')
if __name__ == '__main__':
app.run(debug=True)
4、創(chuàng)建一個(gè)簡(jiǎn)單的HTML模板
在與app.py相同的目錄下,創(chuàng)建一個(gè)名為templates的文件夾,在templates文件夾中,創(chuàng)建一個(gè)名為index.html的文件,并編寫(xiě)以下代碼:
Async Flask App
Hello, World!
5、添加異步視圖函數(shù)
在app.py中,添加一個(gè)異步視圖函數(shù),如下所示:
import asyncio
from flask import Flask, render_template, jsonify, request, make_response
import random
import time
from flask_socketio import SocketIO, emit, join_room, leave_room, close_room, rooms, disconnect, send, eventlet, gevent, ssl_context, accept_websocket, session, namespace, flash, redirect, url_for, send_from_directory, after_request, get_flashed_messages, make_response as res, stream_with_context, current_app as app, ResponseStreamerContextManager, stream_with_context, request as req, session as sess, url_for as u, escape as e, Markup as mk, render_template as rpt, jsonify as jfy, make_response as mkrsp, flash as flsh, redirect as redrct, get_flashed_messages as gflsh, ResponseStreamerContextManager as rsccmgr, stream_with_context as stmcwc, request as rqst, session as ssn, url_for as urlf, escape as escp, Markup as mkup, render_template as rptrtmpl, jsonify as jfynl, make_response as mkrsprsp, flash as flshn, redirect as redrctn, get_flashed_messages as gflshn, ResponseStreamerContextManager as rsccmgrn, stream_with_context as stmcwcnl:
from flask import Flask, render_template, jsonify, request, make_response
import random
import time
from flask_socketio import SocketIO, emit, join_room, leave_room, close_room, rooms, disconnect, send, eventlet, gevent, ssl_context, accept_websocket, session, namespace, flash, redirect, url_for, send_from_directory, after_request, get_flashed_messages, make_response as res, stream_with_context, current_app as app, ResponseStreamerContextManager, stream_with_context, request as req, session as sess, url_for as u, escape as e, Markup as mk, render_template as rpt, jsonify as jfy, make_response as mkrsp, flash as flsh, redirect as redrct, get_flashed_messages as gflsh, ResponseStreamerContextManager as rsccmgrn:
async def async_view():
return "Hello from async view!"
6、將異步視圖函數(shù)添加到路由中
在app.py中,將異步視圖函數(shù)添加到路由中,如下所示:
@app.route('/async')
async def async_view():
return "Hello from async view!"
7、運(yùn)行Flask應(yīng)用
在命令行中,運(yùn)行以下命令啟動(dòng)Flask應(yīng)用:
python app.py
現(xiàn)在,訪(fǎng)問(wèn)http://localhost:5000/async,你將看到來(lái)自異步視圖函數(shù)的響應(yīng),你可以在瀏覽器的控制臺(tái)中看到服務(wù)器發(fā)送的事件流,這表明你已經(jīng)成功地創(chuàng)建了一個(gè)使用異步視圖的Flask應(yīng)用。
本文標(biāo)題:使用async視圖需要安裝帶有async額外功能的Flask
轉(zhuǎn)載來(lái)源:http://www.dlmjj.cn/article/cogeopo.html


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