Python循環僅打印一次狀態更改

Question

我是Python的新手，剛開始了解基本知識。 我試圖在循環中運行腳本以檢查溫度，並且如果外部溫度高於內部溫度或相反溫度，則該函數應打印一次並繼續每5秒檢查一次狀態是否改變。 我發現了一個類似的問題，那是非常有幫助的，但是如果執行代碼，則打印外部溫度會更高，接下來，我加熱內部傳感器並打印出內部溫度更高，除非它不會繼續，否則一切正常。循環有效，但無法識別狀態的下一個變化。 。

import RPi.GPIO as GPIO
import time      
sensor_name_0 = "test"
printed_out = False
printed_in = False  

try:
    while True:   
    if sensor_name_0:
        sensor_0 = open('/sys/devices/w1_bus_master1/w1_master_slaves','r').read().split('\n')[0]
        sensor_1 = open('/sys/devices/w1_bus_master1/w1_master_slaves','r').read().split('\n')[1]

        sensorpath = "/sys/bus/w1/devices/"                   
        sensorfile = "/w1_slave"                                          

    def callsensor_0(sensor_0): 
        f = open(sensorpath + sensor_0 + sensorfile, 'r')     
        lines = f.readlines()                                                 
        f.close()                                                                
        temp_line = lines[1].find('t=')
        temp_output = lines[1].strip() [temp_line+2:] 
        temp_celsius = float(temp_output) / 1000          
        return temp_celsius

    def callsensor_1(sensor_1):         
        f = open(sensorpath + sensor_1 + sensorfile, 'r')     
        lines = f.readlines()                                                 
        f.close()                                                                 
        temp_line = lines[1].find('t=')
        temp_output = lines[1].strip() [temp_line+2:]  
        temp_celsius = float(temp_output) / 1000          
        return temp_celsius


    outside = (str('%.1f' % float(callsensor_0(sensor_0))).rstrip('0').rstrip('.'))  
    inside = (str('%.1f' % float(callsensor_1(sensor_1))).rstrip('0').rstrip('.'))  
    print "loop"

    if outside > inside and not printed_out:                         
        printed_out = True
        print "outside is higher then inside"
        print  outside


    if outside < inside and not printed_in:
        printed_in = True
        print "inside is higher then outside"
        print  inside

    time.sleep(5)    

except KeyboardInterrupt:
print('interrupted!')

Answer 1

在打印相應的消息后，標志printed_in和printed_out都設置為True 。 您沒有將它們設置回False ，因此if條件將永遠不會得到滿足，消息也將不再打印。 你應該設置printed_out為False，如果塊，你要打印的內部溫度較高 ，同樣printed_in設置為False，如果塊，你要打印外界溫度較高

Answer 2

    if outside > inside and not printed_out:                         
        printed_out = True
        print "outside is higher then inside"
        print  outside
        printed_in = False  

    if outside < inside and not printed_in:
        printed_in = True
        print "inside is higher then outside"
        print  inside
        printed_out = False
    time.sleep(5)