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 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

  
  
  
  


  

    {% for key,val in users.items() %}
      
{{val.name}} ({{val.count}})
    {% endfor %}
  

  
  

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

  
  
  
  


  

    {% for key,val in users.items() %}
      
{{val.name}} ({{val.count}})
    {% endfor %}
  

  
  

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。