Why am I getting IOError: [Errno 13] Permission denied?

Question

I am creating Log file for the code but I am getting the following error :

[Tue Jun 11 17:22:59 2013] [error] [client 127.0.0.1]     import mainLCF
[Tue Jun 11 17:22:59 2013] [error] [client 127.0.0.1]   File "/home/ai/Desktop/home/ubuntu/LCF/GA-LCF/mainLCF.py", line 10, in 
[Tue Jun 11 17:22:59 2013] [error] [client 127.0.0.1]     logging.basicConfig(filename='genetic.log',level=logging.DEBUG,format='%(asctime)s %(message)s', datefmt='%m/%d/%Y %I:%M:%S %p')
[Tue Jun 11 17:22:59 2013] [error] [client 127.0.0.1]   File "/usr/lib/python2.7/logging/__init__.py", line 1528, in basicConfig
[Tue Jun 11 17:22:59 2013] [error] [client 127.0.0.1]     hdlr = FileHandler(filename, mode)
[Tue Jun 11 17:22:59 2013] [error] [client 127.0.0.1]   File "/usr/lib/python2.7/logging/__init__.py", line 901, in __init__
[Tue Jun 11 17:22:59 2013] [error] [client 127.0.0.1]     StreamHandler.__init__(self, self._open())
[Tue Jun 11 17:22:59 2013] [error] [client 127.0.0.1]   File "/usr/lib/python2.7/logging/__init__.py", line 924, in _open
[Tue Jun 11 17:22:59 2013] [error] [client 127.0.0.1]     stream = open(self.baseFilename, self.mode)
[Tue Jun 11 17:22:59 2013] [error] [client 127.0.0.1] IOError: [Errno 13] Permission denied: '/genetic.log'

I have checked the permissions in the particular folder where I want to make the log but still getting the error . My code is : (name is mainLCF.py)

import logging
import sys


logging.basicConfig(filename='genetic.log',level=logging.DEBUG,format='%(asctime)s %(message)s', datefmt='%m/%d/%Y %I:%M:%S %p')
logging.debug("starting of Genetic Algorithm")

sys.path.append("/home/ai/Desktop/home/ubuntu/LCF/ws_code")

import  blackboard
from pyevolve import *
def eval_func(chromosome):
     some function here

My system's file structure is :

/ 
 home
  ai
   Desktop
     home
      ubuntu
       LCF
        ws_code                 GA-LCF
           blackboard.py             main-LCF.py

I am calling mainLCF.py from another function lcf.py which is in ws_code .

Answer 1

You need to change the Logfile path by using logging.handlers python module . In my case I did the following stuff :

import logging
from logging.handlers import RotatingFileHandler
 import  blackboard

WEBAPP_CONSTANTS = {
'LOGFILE': '/home/ai/Desktop/home/ubuntu/LCF/GA-LCF/ga.log',
}
def getWebAppConstants(constant):
     return WEBAPP_CONSTANTS.get(constant, False)

LOGFILE = getWebAppConstants('LOGFILE')
log_handler = RotatingFileHandler(LOGFILE, maxBytes=1048576, backupCount=5)
log_handler.setFormatter(logging.Formatter( '%(asctime)s %(levelname)s: %(message)s ' '[in %(pathname)s:%(lineno)d]'))
applogger = logging.getLogger("GA")
applogger.setLevel(logging.DEBUG)
applogger.addHandler(log_handler)
applogger.debug("Starting of Genetic Algorithm")

from pyevolve import *

def eval_func(chromosome):
     some function here

and it worked. However I still don't know the reason why it was earlier trying to make genetic.log at root directory .