python create daily folder

Question

I would like to read from the serial of RPi and store the data in a daily folder as a 'csv.' file. I can create a file, write/read to/from csv file and had the serial comm working with putty for now (tried in a different project). In the future, the comm is going to be between pi and a various sensor. Considering everything else is working I am not sure how to create a seperate file automatically for each day. This is what I've done so far;

import serial
import time
import csv

def readLine(port)
    rv = ""
    while True:
        ch = port.read()
        rv += ch
        if ch == '\r' or ch =='':
            return rv

port = serial.Serial("/dev/ttyAMA0", baudrate = 115200, timeout = 10)

while True:
    rcv=readLineCR(port)

str1 = time.strftime("%d%m%y")
file = open('directory....')

with open('test.csv', 'w') as fp:
     a = csv.writer(fp, delimiter=',')
     # data to be tested
     data = [[str1,'1234'],[str1,'4321']]
     a.writerows(data)
     print('csv is created on: ' + str1)

reader = csv.reader(file)
for line in reader:
print(line)

Any help would be appreciated

Using a python logging.handlers.TimedRotatingFileHandler you can easily create a logging system where files rotate automatically. If you skip the foldering. — msvalkon
– msvalkon, Commented May 5, 2014 at 13:28
Thanks for the comment @msvalkon. Creating a logging system seems a little bit advanced at the moment. But will try in the future. — Cugomastik
– Cugomastik, Commented May 5, 2014 at 14:01

furas · Accepted Answer · 2014-05-05 13:16:04Z

2

Use datetime.datetime.now().strftime("%Y-%d-%m") to create folder name, os.path.exists(...) to check if folder exists and os.mkdir(...) to create new folder.

answered May 5, 2014 at 13:16

furas

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Cugomastik · Accepted Answer · 2014-05-06 07:00:37Z

1

Thank you @furas. this is what I did and seems like its working.

import os
todayDate = time.strftime("%d-%m-%y")
directory = '/home/pi/...' + todayDate
if not os.path.exists(directory)
   os.makedirs(directory)

answered May 6, 2014 at 7:00

Cugomastik

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