Need to make this script work in OS X and Linux

Hey guys,

I would like to make this Python script compatible with OS X and Linux. If I lauch the script on OS X.

import os
import sys

#path to file from the first argument (no checking)
fname = sys.argv[1]
#fname = r'E:\\TV Shows\\How I Met Your Mother\\Season 6\\How.I.Met.Your.Mother.S06E18.720p.HDTV.X264-DIMENSION.mkv'
print fname

# Now split the path to the directory and the bare name (better to say it 
# splits the last element of the path and it does not care whether it is 
# a file name or a subdirectory name.
path, barename = os.path.split(fname)
print path
print barename

parent = os.path.normpath(os.path.join(path, '..'))
print "parent directory:", parent

# Create file, delete and recreate it if it exists. This will
# change the date modified status of the Show Name folder
# so you can view your show list by date order.
logname = os.path.join(parent, 'DateMarker.log')
if os.path.isfile(logname):
    os.remove(logname)
logfile = open(logname, 'w')
logfile.write('Episode ' + fname + ' has been created. This is a marker file, to change the date modified status of the show name.')
logfile.close()

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Everything works except this part

if os.path.isfile(logname):
    os.remove(logname)
logfile = open(logname, 'w')
logfile.write('Episode ' + fname + ' has been created. This is a marker file, to change the date modified status of the show name.')
logfile.close()

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Thanks