the code given in chapter 2 of ceate-modify-reuse in python book to compare snapshots is not working.....
its not comparing the snapshots and giving exception message can anyone help me?

the complete code is available in code resources section of this site

parameters are passed in snap1 and snap2
its giving exception mssg "Problems encountered accessing snapshot files!"
here is the code:
def compareSnapshots(snapfile1, snapfile2):

try:
pkl_file = open(snapfile1, 'rb')
dirs1 = pickle.load(pkl_file)
files1 = pickle.load(pkl_file)
pkl_file.close()

pk2_file = open(snapfile2, 'rb')
dirs2 = pickle.load(pk2_file)
files2 = pickle.load(pk2_file)
pk2_file.close()
except:
print "Problems encountered accessing snapshot files!"
raw_input("\n\nPress [Enter] to continue...")
return

result_dirs = list(difflib.unified_diff(dirs1, dirs2))
result_files = list(difflib.unified_diff(files1, files2))

added_dirs = []
removed_dirs = []
added_files = []
removed_files = []

for result in result_files:
if result.endswith("\n") == -1:
if result.startswith('+'):
resultadd = result.strip('+')
added_files.append(resultadd)
elif result.startswith('-'):
resultsubtract = result.strip('-')
removed_files.append(resultsubtract)

for result in result_dirs:
if result.endswith("\n") == -1:
if result.startswith('+'):
resultadd = result.strip('+')
added_dirs.append(resultadd)
elif result.startswith('-'):
resultsubtract = result.strip('-')
removed_dirs.append(resultsubtract)

print "\n\nAdded Directories:\n"
printList(added_dirs)
print "\n\nAdded Files:\n"
printList(added_files)
print "\n\nRemoved Directories:\n"
printList(removed_dirs)
print "\n\nRemoved Files:\n"
printList(removed_files)
raw_input("\n\nPress [Enter] to continue...")

Hi

I've just bumped into the same issue. Did you manage to debug it?

Actually, I don't get the exception, but the result is always empty as if the snapshot were identical, and I'm sure I added some directories and files and removed other before taking the second snapshot.