python轮询机制控制led实例
更新时间:2020年05月03日 15:06:42 作者:Neil-Yale
这篇文章主要介绍了python轮询机制控制led实例,具有很好的参考价值,希望对大家有所帮助。一起跟随小编过来看看吧
我就废话不多说了,大家还是直接看代码吧!
# -*- coding:utf-8 -*- # File: ceshitianqi import urllib2 import json import time import datetime import serial import random import os import sys APIKEY = 'ZPdLyl***=' #改成你的APIKEY ser=serial.Serial("/dev/ttyUSB2",9600,timeout=1) def read(key): ser.write(key) print("output:"+key) time.sleep(1) response = ser.readall() print(response) print(type(response)) return response def http_put(key): val = read(key) #获取Arduino的数据 CurTime = datetime.datetime.now() url='http://api.heclouds.com/devices/**1/datapoints' #values={'datastreams':[{"id":"temp","datapoints":[{"at":CurTime.isoformat(),"value":val}]}]} print(type(val)) if key== "a" : values={'datastreams':[{"id":"humidity","datapoints":[{"at":CurTime.isoformat(),"value":val}]}]} if key== "b" : values={'datastreams':[{"id":"temperature","datapoints":[{"at":CurTime.isoformat(),"value":val}]}]} jdata = json.dumps(values) # 对数据进行JSON格式化编码 #打印json内容 print jdata request = urllib2.Request(url, jdata) request.add_header('api-key', APIKEY) request.get_method = lambda:'POST' # 设置HTTP的访问方式 request = urllib2.urlopen(request) return request.read() str = ("a","b") while True: for i in str: f = open('1.txt') e = f.read() if e == "1\n": ser.write("c") if e == "0\n": ser.write("d") f.close() resp = http_put(i) time.sleep(2)
轮询1.txt
1则点亮
0则关闭
补充知识:python笔记(轮询、长轮询)
一、轮询
views.py
from flask import Flask,render_template,request,jsonify app = Flask(__name__) USERS = { '1':{'name':'贝贝','count':1}, '2':{'name':'小东北','count':0}, '3':{'name':'何伟明','count':0}, } @app.route('/user/list') def user_list(): import time return render_template('user_list.html',users=USERS) @app.route('/vote',methods=['POST']) def vote(): uid = request.form.get('uid') USERS[uid]['count'] += 1 return "投票成功" @app.route('/get/vote',methods=['GET']) def get_vote(): return jsonify(USERS) if __name__ == '__main__': app.run(threaded=True)
html
<!DOCTYPE html> <html lang="zh-CN"> <head> <meta charset="UTF-8"> <title>Title</title> <meta name="viewport" content="width=device-width, initial-scale=1"> <style> li{ cursor: pointer; } </style> </head> <body> <ul id="userList"> {% for key,val in users.items() %} <li uid="{{key}}">{{val.name}} ({{val.count}})</li> {% endfor %} </ul> <script src="https://cdn.bootcss.com/jquery/3.3.0/jquery.min.js"></script> <script> $(function () { $('#userList').on('dblclick','li',function () { var uid = $(this).attr('uid'); $.ajax({ url:'/vote', type:'POST', data:{uid:uid}, success:function (arg) { console.log(arg); } }) }); }); /* 获取投票信息 */ function get_vote() { $.ajax({ url:'/get/vote', type:"GET", dataType:'JSON', success:function (arg) { $('#userList').empty(); $.each(arg,function (k,v) { var li = document.createElement('li'); li.setAttribute('uid',k); li.innerText = v.name + "(" + v.count + ')' ; $('#userList').append(li); }) } }) } setInterval(get_vote,3000); </script> </body> </html>
二、长轮询
views.py
from flask import Flask,render_template,request,jsonify,session import uuid import queue app = Flask(__name__) app.secret_key = 'asdfasdfasd' USERS = { '1':{'name':'贝贝','count':1}, '2':{'name':'小东北','count':0}, '3':{'name':'何伟明','count':0}, } QUEQUE_DICT = { } @app.route('/user/list') def user_list(): user_uuid = str(uuid.uuid4()) QUEQUE_DICT[user_uuid] = queue.Queue() session['current_user_uuid'] = user_uuid return render_template('user_list.html',users=USERS) @app.route('/vote',methods=['POST']) def vote(): uid = request.form.get('uid') USERS[uid]['count'] += 1 for q in QUEQUE_DICT.values(): q.put(USERS) return "投票成功" @app.route('/get/vote',methods=['GET']) def get_vote(): user_uuid = session['current_user_uuid'] q = QUEQUE_DICT[user_uuid] ret = {'status':True,'data':None} try: users = q.get(timeout=5) ret['data'] = users except queue.Empty: ret['status'] = False return jsonify(ret) if __name__ == '__main__': app.run(threaded=True)
html
<!DOCTYPE html> <html lang="zh-CN"> <head> <meta charset="UTF-8"> <title>Title</title> <meta name="viewport" content="width=device-width, initial-scale=1"> <style> li{ cursor: pointer; } </style> </head> <body> <ul id="userList"> {% for key,val in users.items() %} <li uid="{{key}}">{{val.name}} ({{val.count}})</li> {% endfor %} </ul> <script src="https://cdn.bootcss.com/jquery/3.3.0/jquery.min.js"></script> <script> $(function () { $('#userList').on('click','li',function () { var uid = $(this).attr('uid'); $.ajax({ url:'/vote', type:'POST', data:{uid:uid}, success:function (arg) { console.log(arg); } }) }); get_vote(); }); /* 获取投票信息 */ function get_vote() { $.ajax({ url:'/get/vote', type:"GET", dataType:'JSON', success:function (arg) { if(arg.status){ $('#userList').empty(); $.each(arg.data,function (k,v) { var li = document.createElement('li'); li.setAttribute('uid',k); li.innerText = v.name + "(" + v.count + ')' ; $('#userList').append(li); }) } get_vote(); } }) } </script> </body> </html>
以上这篇python轮询机制控制led实例就是小编分享给大家的全部内容了,希望能给大家一个参考,也希望大家多多支持脚本之家。
相关文章
详解解决Python memory error的问题(四种解决方案)
这篇文章主要介绍了详解解决Python memory error的问题(四种解决方案),文中通过示例代码介绍的非常详细,对大家的学习或者工作具有一定的参考学习价值,需要的朋友们下面随着小编来一起学习学习吧2019-08-08
最新评论