Hi Tony,
I still believe there is a problem.
I was searching for os.stat problems so I hadn't seen that one yet. (THANKS)
I just read that thread but it seems that the conclusion was that this was a
bug in a Microsoft c runtime library.
Here's why I think there is still a problem:
I created a file and specifically set the created date, last accessed date
and last write date to
01/02/2003 12:34:56
After setting the date and time on the file I verified the following:
The dir /tc command shows the correct Create date of 01/02/2003 12:34
The dir /ta command shows the correct Access date of 01/02/2003 12:34
The dir /tw command shows the correct Write date of 01/02/2003 12:34
Looking at the properties of the file in Windows Explorer also shows that
all 3 dates match.
When Python 2.4.2 os.stat is used to get those timestamps all 3 are CORRECT
When Python 2.5.1 os.stat is used to get those timestamps all 3 are WRONG
and they are off by exact 1 hour
01/02/2003 11:34:56 instead of 01/02/2003 12:34:56
In the case of my above test I know exactly what the timestamp on the file
is because I manually set it so that all 3 timestamps are the same.
Since Python 2.5.1 does not return the known values for that files
timestamps how can it not be a Python 2.5.1 bug?
Further testing shows that the results are somewhat inconsistent, many times
the create and access date are correct but the Last Write timestamp is
wrong. It is generally off by one hour but I have seen situations where it
was +1 hour and other situations where it was -1 hour.
I even found situations where the python timestamp was 1 minute later. (I
know about the 2 second timestamps on FAT, all my filesystems are NTFS). I
just found a situation where the python timestamp was 02:51 PM and the
windows timestamp was 02:12 PM. DST or timezone changes are not going to
make the results be off by 39 minutes? (My timezone is GMT - 5:00).
As an additional test I wrote the following Python program which takes a
directory name as a paramater.
It retrieves all 3 dates for all files in all directories and subdirectories
for the specified directory name.
First it gets the dates using Python and os.stat, then it runs the dir /tc,
dir /ta, and dir /tw commands on the file.
Finally it compares the dates and times returned by Python against the dates
and times that the Windows dir command is reporting.
If you run the program using Python 2.4.2 then ALL dates and times returned
by Python 2.4.2 correctly match the dates and times that Windows reports.
If you run the program using Python 2.5.1 against the same directory then
you get intermittient results.
As a quick test I ran it against a directory on my home directory.
Python 2.4.2 all dates matched between what the Windows dir command reported
and what Python 2.4.2 reported.
Python 2.5.1 had the following differences (more than 50% of the time it was
wrong)
Total Files Processed : 149
Matched All 3 Dates : 70
Did NOT Match All 3 Dates: 79
Matched Create Date : 69
Did NOT Match Create Date: 10
Matched Access Date : 59
Did NOT Match Access Date: 20
Matched Write Date : 11
Did NOT Match Write Date : 68
Here's the source for the check_dates.py program. Run it for youself and
see what your results are.
import os
import stat
import sys
import time
if len(sys.argv) == 1:
print
print '%s path_to_check' % (sys.argv[0])
print
raise SystemExit
else:
path_to_check = sys.argv[1]
file_count = 0
file_match_count = 0
file_no_match_count = 0
create_match_count = 0
create_no_match_count = 0
access_match_count = 0
access_no_match_count = 0
write_match_count = 0
write_no_match_count = 0
for root, dirs, files in os.walk(r'%s' % path_to_check):
for file in files:
file_count = file_count + 1
file_name = os.path.join(root, file)
create_ts_match = False
access_ts_match = False
write_ts_match = False
file_stats = os.stat(file_name)
python_create_ts = time.strftime('%m/%d/%Y %I:%M %p',
time.localtime(file_stats[stat.ST_CTIME]))
python_access_ts = time.strftime('%m/%d/%Y %I:%M %p',
time.localtime(file_stats[stat.ST_ATIME]))
python_write_ts = time.strftime('%m/%d/%Y %I:%M %p',
time.localtime(file_stats[stat.ST_MTIME]))
win_create_ts = os.popen('dir /a /tc "%s"' %
(file_name)).readlines()[5][0:20]
win_access_ts = os.popen('dir /a /ta "%s"' %
(file_name)).readlines()[5][0:20]
win_write_ts = os.popen('dir /a /tw "%s"' %
(file_name)).readlines()[5][0:20]
if python_create_ts == win_create_ts: create_ts_match = True
if python_access_ts == win_access_ts: access_ts_match = True
if python_write_ts == win_write_ts: write_ts_match = True
if create_ts_match and access_ts_match and write_ts_match:
# All timestamps match
file_match_count = file_match_count + 1
else:
file_no_match_count = file_no_match_count + 1
print
print 'File Name : %s' % (file_name)
print
if create_ts_match:
create_match_count = create_match_count + 1
else:
create_no_match_count = create_no_match_count + 1
print 'python_create_ts: %s' % (python_create_ts)
print 'win_create_ts : %s' % (win_create_ts)
print
if access_ts_match:
access_match_count = access_match_count + 1
else:
access_no_match_count = access_no_match_count + 1
print 'python_access_ts: %s' % (python_access_ts)
print 'win_access_ts : %s' % (win_access_ts)
print
if write_ts_match:
write_match_count = write_match_count + 1
else:
write_no_match_count = write_no_match_count + 1
print 'python_write_ts : %s' % (python_write_ts)
print 'win_write_ts : %s' % (win_write_ts)
print
#
# Show Count Results
#
print 'Total Files Processed : %s' % (file_count)
print
print 'Matched All 3 Dates : %s' % (file_match_count)
print 'Did NOT Match All 3 Dates: %s' % (file_no_match_count)
print
print 'Matched Create Date : %s' % (create_match_count)
print 'Did NOT Match Create Date: %s' % (create_no_match_count)
print
print 'Matched Access Date : %s' % (access_match_count)
print 'Did NOT Match Access Date: %s' % (access_no_match_count)
print
print 'Matched Write Date : %s' % (write_match_count)
print 'Did NOT Match Write Date : %s' % (write_no_match_count)
print
"Tony Meyer" <[EMAIL PROTECTED]> wrote in message
news:[EMAIL PROTECTED]
> On Jun 1, 9:16 am, "Joe Salmeri" <[EMAIL PROTECTED]> wrote:
>> I just upgraded from Python 2.4.2 to Python 2.5.1 and have found some
>> unexpected behavior that appears to be a bug in the os.stat module.
>
> Have you read this thread?
>
> http://groups.google.com/group/comp.lang.python/browse_thread/thread/890eef2197c6f045/5466283a8253cafb?lnk=gst&q=getmtime&rnum=3#5466283a8253cafb
>
> I suspect that it explains your problem.
>
> Cheers,
> Tony
>
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