python轮询机制控制led实例
我就废话不多说了，大家还是直接看代码吧！
# -*- coding:utf-8 -*- # File: ceshitianqi import urllib2import jsonimport timeimport datetimeimport serial import randomimport osimport sys APIKEY = ’ZPdLyl***=’ #改成你的APIKEYser=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 == '1n':ser.write('c')if e == '0n':ser.write('d') f.close() resp = http_put(i) time.sleep(2)
轮询1.txt
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补充知识：python笔记(轮询、长轮询)
一、轮询
views.py
from flask import Flask,render_template,request,jsonifyapp = 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,sessionimport uuidimport queueapp = 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好吧啦网。
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