python轮询机制控制led实例

2023-07-26 09:15:04 87

我就废话不多说了，大家还是直接看代码吧！

#-*-coding:utf-8-*-
#File:ceshitianqi

importurllib2
importjson
importtime
importdatetime
importserial
importrandom
importos
importsys

APIKEY='ZPdLyl***='#改成你的APIKEY
ser=serial.Serial("/dev/ttyUSB2",9600,timeout=1)

defread(key):
ser.write(key)
print("output:"+key)
time.sleep(1)
response=ser.readall()
print(response)
print(type(response))
returnresponse

defhttp_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))
ifkey=="a":
values={'datastreams':[{"id":"humidity","datapoints":[{"at":CurTime.isoformat(),"value":val}]}]}
ifkey=="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
printjdata
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)
returnrequest.read()

str=("a","b")
whileTrue:
	foriinstr:
		f=open('1.txt')
		e=f.read()
		ife=="1\n":
			ser.write("c")
		ife=="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

fromflaskimportFlask,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')
defuser_list():
importtime
returnrender_template('user_list.html',users=USERS)

@app.route('/vote',methods=['POST'])
defvote():
uid=request.form.get('uid')
USERS[uid]['count']+=1
return"投票成功"

@app.route('/get/vote',methods=['GET'])
defget_vote():

returnjsonify(USERS)


if__name__=='__main__':
app.run(threaded=True)

html





Title





{%forkey,valinusers.items()%}
{{val.name}}({{val.count}})
{%endfor%}

二、长轮询

views.py

fromflaskimportFlask,render_template,request,jsonify,session
importuuid
importqueue

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')
defuser_list():
user_uuid=str(uuid.uuid4())
QUEQUE_DICT[user_uuid]=queue.Queue()

session['current_user_uuid']=user_uuid
returnrender_template('user_list.html',users=USERS)

@app.route('/vote',methods=['POST'])
defvote():
uid=request.form.get('uid')
USERS[uid]['count']+=1
forqinQUEQUE_DICT.values():
q.put(USERS)
return"投票成功"


@app.route('/get/vote',methods=['GET'])
defget_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
exceptqueue.Empty:
ret['status']=False

returnjsonify(ret)



if__name__=='__main__':
app.run(threaded=True)

html





Title





{%forkey,valinusers.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毛票票。

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