Incorrect tell result

[agroce]

import shutil
import pyfakefs.fake_filesystem
import os

ROOT_PATH = "/Volumes/ramdisk/test"

fs = pyfakefs.fake_filesystem.FakeFilesystem()
fs.CreateDirectory('/Volumes')
fs.CreateDirectory('/Volumes/ramdisk')
fs.CreateDirectory('/Volumes/ramdisk/test')
os0 = pyfakefs.fake_filesystem.FakeOsModule(fs)
opener0 = pyfakefs.fake_filesystem.FakeFileOpen(fs)

if False:
    os0 = os
    shutil.rmtree(ROOT_PATH)
    os.mkdir(ROOT_PATH)
    opener0 = open

path0 = ROOT_PATH 
path0 += os.path.sep + component0 
bytes0 = 0 
bytes0 += 1 
str0 = "" 
str0 += 'a' 
str0 += 'a' 
file0 = opener0(path0,'a') 
file0.write(str0) 
file0.seek(bytes0) 
result = file0.tell() 

print result

2 for pyfakefs, 1 for OS

[mrbean-bremen]

Again the same code involved... I really have to rethink that part.