如何让这两个线程一个接一个地不断运行python？

Question

所以我有这个代码，我需要这两个线程一个接一个地运行。

所以，一旦线程1完成，线程2就会进入，一旦线程2完成，线程1就会进入线程2等......就像不断循环一样。

import httplib, urllib 
import time, sys 
import serial 
from threading import Thread 
#from multiprocessing import Process 

key = 'MY API KEY' #API Key required for ThingSpeak. 
rfWaterLevelVal = 0   #Global variable that holds the final water level value. 

ser = serial.Serial('/dev/ttyUSB0',9600) 

#Gathers the rf data received and separated it to obtain the water level data. 
def rfWaterLevel(): 
    global rfWaterLevelVal 
    rfDataArray = ser.readline().strip().split() 
    print 'incoming: %s' %rfDataArray 
    if len(rfDataArray) == 5: 
     rfWaterLevelVal = float(rfDataArray[4]) 
     print 'RFWater Level1: %.3f cm' % (rfWaterLevelVal) 

#Created purely to making the multithreading easier.   
def rfWaterLevelFinal(): 
    while True: 
     try: 
      rfWaterLevel() 
     except KeyboardInterrupt: 
      print "caught keyboard interrupt" 
      sys.exit() 

#Sends the sensor data over to ThingSpeak. 
def sendData(): 
    global rfWaterLevelVal 

    params = urllib.urlencode({'field1':rfWaterLevelVal, 'key':key}) 
    headers = {"Content-type" : "application/x-www-form-urlencoded","Accept": "text/plain"} 
    conn = httplib.HTTPConnection("api.thingspeak.com:80", timeout = 5) 
    conn.request("POST", "/update", params, headers) 
    response = conn.getresponse() 
    print response.status, response.reason 
    data = response.read() 
    conn.close() 

#Created purely to make multithreading easier. 
def sendDataFinal(): 
    while True: 
     try: 
      sendDataFinal() 
     except KeyboardInterrupt: 
      print "caught keyboard interrupt" 
      sys.exit() 

#start thread 1 for rf water level data. 
t1 = Thread(target = rfWaterLevelFinal()) 
t1.start() 

#start thread 2 for sending the data. 
t2 = Thread(target = sendDataFinal()) 
t2.start() 

#wait for both threads to finish 
t1.join() 
t2.join() 

所以基本上我需要这个线程1开始接不完，线程2开始接不完，要不断地运行（好像它是一个无限循环）。

我已经看过在Python中使用一个线程池，但我不知道如何应用它。

关于我能做些什么来获得我想要的结果的想法？

干杯 在此先感谢！

Answer 1

这是你想要的，

while True: 
    t1 = Thread(target = rfWaterLevelFinal()) 
    t1.start() 
    t1.join() 
    t2 = Thread(target = sendDataFinal()) 
    t2.start() 
    t2.join() 

但是，没有必要像与线程运行，你可以调用的方法。

while True: 
    rfWaterLevelFinal() 
    sendDataFinal()