我正在为将数据发送到ThingSpeak的嵌入式系统开发python脚本。
为此(并用于研究python),我使用了线程模块,并且还使用了ThingSpeak模块。
基本上我的脚本创建了2个线程:
除了在ThingSpeak上发布之外,所有其他工作。注意:在没有线程的情况下在thingSpeak上发布。
我收到此错误:“ TypeError:'str'对象不支持项目分配”
Traceback (most recent call last):
File "/usr/lib/python2.7/threading.py", line 801, in __bootstrap_inner
self.run()
File "/usr/lib/python2.7/threading.py", line 754, in run
self.__target(*self.__args, **self.__kwargs)
File "thingSpeak.py", line 57, in ThingSpeak_Thread
response = thingSpeakHandler.update(jsonMessage)
File "/usr/lib/python2.7/site-packages/thingspeak/thingspeak.py", line 110, in update
data['api_key'] = self.write_key
TypeError: 'str' object does not support item assignment
我认为此错误与线程的添加有关。
这是我的代码:
import onionGpio
import time
import thingspeak
import sys
import threading
import random
import thread
import json
# Declare variables
heartBeatDelaySec = 1.0
heartBeatLedStatus = 0
heartBeatDisable = False
thingSpeakDelaySec = 10
thingSpeakChannel = 98765
thingSpeakWriteKey = '1234556'
thingSpeakReadKey = '123456'
def HeartBeatThread( name, delay, runEvent ):
global heartBeatLedStatus
print ("Task " + name + " started")
while runEvent.is_set():
blueLed.setValue( heartBeatLedStatus )
if( heartBeatLedStatus == 0 ):
heartBeatLedStatus = 1
else:
heartBeatLedStatus = 0
time.sleep(delay)
# Shut-down Led
blueLed.setValue( 1 )
def ThingSpeak_Thread( name, delay, thingSpeakChannel, thingSpeakWriteKey, runEvent ):
thingSpeakHandler = thingspeak.Channel( id=thingSpeakChannel, write_key=thingSpeakWriteKey, fmt='json' )
while runEvent.is_set():
temp = random.randint(12, 38)
rH = random.randint(30, 68)
# Build JSON with data
data = {}
data['1'] = temp
data['2'] = rH
jsonMessage = json.dumps(data)
print( "Publishing: " + jsonMessage )
response = thingSpeakHandler.update(jsonMessage)
time.sleep(delay)
# Led Initialize
blueLed = onionGpio.OnionGpio(15)
greenLed = onionGpio.OnionGpio(16)
redLed = onionGpio.OnionGpio(17)
blueLed.setOutputDirection(1)
greenLed.setOutputDirection(1)
redLed.setOutputDirection(1)
blueLed.setValue(1)
greenLed.setValue(1)
redLed.setValue(1)
print ("GPIO configured")
# Initialize Threads
runEvent = threading.Event()
runEvent.set()
heartBeatThreadHandler = threading.Thread(target = HeartBeatThread, args = ("Heart Beat", heartBeatDelaySec, runEvent))
thingSpeakThreadHandler = threading.Thread(target = ThingSpeak_Thread, args = ("ThingSpeak", thingSpeakDelaySec, thingSpeakChannel, thingSpeakWriteKey, runEvent))
# Start Threads
heartBeatThreadHandler.start()
thingSpeakThreadHandler.start()
try:
while( True ):
time.sleep(.01)
except:
print ("Attempting to close threads. Max wait = " + str(max(heartBeatDelaySec, thingSpeakDelaySec)) + "sec")
runEvent.clear()
heartBeatThreadHandler.join()
thingSpeakThreadHandler.join()
print ("Threads successfully closed")
非常感谢您的帮助。
最好的问候, 费德里科
答案 0 :(得分:1)
json.dumps()
中的 ThingSpeak_Thread
返回字符串(请参见docs)。然后,您将此 string 传递给thingSpeakHandler.update()
方法,但是
期望dict
。因此,请删除jsonMessage = json.dumps(data)
并将data
传递给update()
。