仅在串行设备输出数据时写入

Question

我试图做一个数据记录器，而不是写每分钟只输出一次的串行设备的输出。我需要它在输出上有一个时间戳。到目前为止，我拥有的代码将记录输出，但它会使用设备输出之间的时间戳记来记录空白。当设备输出时，如何只用时间戳写一行？

#!/usr/bin/env python
Log data from serial port

import argparse
import serial
import datetime
import time
import os
timestr = time.strftime("%Y%m%d")
Tstamp = time.strftime("%Y/%m/%d %H:%M ")

parser = argparse.ArgumentParser(formatter_class=argparse.ArgumentDefaultsHelpFormatter)
parser.add_argument("-d", "--device", help="device to read from", default="/dev/ttyUSB0")
parser.add_argument("-s", "--speed", help="speed in bps", default=9600, type=int)
args = parser.parse_args()

outputFilePath = os.path.join(os.path.dirname(__file__),
                 datetime.datetime.now().strftime("%Y-%m-%d") + ".csv")

with serial.Serial(args.device, args.speed) as ser, open(outputFilePath,'w') as outputFile:
    print("Logging started. Ctrl-C to stop.") 
    try:
        while True:
            time.sleep(1)  
            x = (ser.read(ser.inWaiting()))
            data = x.decode('UTF-8')          
            outputFile.write(Tstamp + " "  + data + '\n')
            outputFile.flush()
    except KeyboardInterrupt:
        print("Logging stopped")

很抱歉格式不正确，我不确定如何在此处显示它。

Answer 1

通过添加if x!= ""并正确缩进，我可以使其正常工作。现在，我只需要对其进行修复即可添加文件而不覆盖它。

#!/usr/bin/env python
# Log data from serial port


import argparse
import serial
import datetime
import time
import os


parser = argparse.ArgumentParser(formatter_class=argparse.ArgumentDefaultsHelpFormatter)
parser.add_argument("-d", "--device", help="device to read from", default="/dev/ttyUSB0")
parser.add_argument("-s", "--speed", help="speed in bps", default=9600, type=int)
args = parser.parse_args()

outputFilePath = os.path.join(os.path.dirname(__file__),
                 datetime.datetime.now().strftime("%Y-%m-%d") + ".csv")

with serial.Serial(args.device, args.speed) as ser, open(outputFilePath,'w') as outputFile:
    print("Logging started. Ctrl-C to stop.") 
    try:
        while True:
            time.sleep(1) 
            x = (ser.read(ser.inWaiting())) 
            data = x.decode('UTF-8')
            if data !="":
                outputFile.write(time.strftime("%Y/%m/%d %H:%M ") + " " + data  )
                outputFile.flush()

    except KeyboardInterrupt:
        print("Logging stopped")