[英]Printing to CSV Prints Header Every Iteration
我试图将来自arduino的数据写入csv ia干净,用户友好的格式。 我想要的是将要输入的数据打印出来,并提供一个标题,以便用户查看列所代表的内容。 现在,当我将其打印到csv时,每次迭代都获得标头。 我将得到的是:
Newtons
#
Newtons
#
我尝试使用csv.writer和csv.DictWriter并产生相同的结果。 对于上下文,我有一个arduino从传感器获取数据,然后python然后根据传感器的读数告诉arduino做什么,并且我想保存此传感器读数以进行分析。
Python代码
import serial
import csv
import time
from time import localtime, strftime
import warnings
import serial.tools.list_ports
__author__ = 'Matt Munn'
arduino_ports = [
p.device
for p in serial.tools.list_ports.comports()
if 'Arduino' in p.description
]
if not arduino_ports:
raise IOError("No Arduino found - is it plugged in? If so, restart computer.")
if len(arduino_ports) > 1:
warnings.warn('Multiple Arduinos found - using the first')
Arduino = serial.Serial(arduino_ports[0],9600,timeout=1)
time.sleep(2)
start_time=time.time()
Force = []
Actuator_Signal=[]
numPoints = 10
ForceList = [0]*numPoints
AvgForce = 0
#This creates the unique file for saving test result data.
outputFileName = "Cycle_Pull_Test_#.csv"
outputFileName = outputFileName.replace("#", strftime("%Y-%m-%d_%H %M %S", localtime()))
with open(outputFileName, 'w',newline='') as outfile:
#This takes the data from the arduino and interprits it.
while True:
while (Arduino.inWaiting()==0):
pass
try:
data = Arduino.readline()
dataarray = data.decode().rstrip().split(',')
for i in range(0,numPoints):
Force = round(float(dataarray[0]),3)
ForceList[i] = Force
AvgForce = round((sum(ForceList)/numPoints),3)
print (AvgForce)
#This Controls the actuators direction based on the force input on the loadcell.
if AvgForce >50:
Arduino.write(b'd')
else:
Arduino.write(b'u')
except (KeyboardInterrupt, SystemExit,IndexError,ValueError):
pass
#This writes the data from the loadcell to a csv file for future use.
HeaderNames = ['Newtons']
outfileWrite = csv.DictWriter(outfile, fieldnames = HeaderNames)
outfileWrite.writeheader()
outfileWrite.writerow({'Newtons' : [AvgForce]})
问题是您对输出文件的定义和对writeheader()
的调用在循环中
这应该工作:
#This takes the data from the arduino and interprits it.
outfileWrite = csv.DictWriter(outfile, fieldnames = HeaderNames)
outfileWrite.writeheader()
while True:
# Rest of the while loop
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