Error From Calling To Python To Set The Mtime
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them; it only takes a minute: Sign up python os.path.getmtime() time not changing up vote 8 down vote favorite 2 I have a quick issue with python's os.path.getmtime() function. I have observed some weird behavior. I am working on
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a web app that checks periodically to see if a certain file has been modified and decides whether or not to refresh based on that. In my local python command line, when I change the file and call os.path.getmtime(file_name) the return value from mtime has changed to reflect the change in the file. However, when I call os.path.getmtime() in my web app the return value before and after the change is the same. I did some research online and python copy file found some stuff to suggest that the os module needs to be reloaded for the change to the file to be registered. So, in my web app I reloaded the os module, but mtime still does not reflect changes to the file. Has anyone else encountered this problem before or know a solution? I have included a code snippet below from the webapp: import os def function_name(): reload(os) file_path = '/dir/lib/some_file.js' try: mtime = os.path.getmtime(file_path) except os.error: pass return mtime python python-2.7 os.path share|improve this question edited Sep 27 '13 at 20:53 Martijn Pieters♦ 499k7412911449 asked Sep 27 '13 at 20:52 Mars J 377721 1 No, reloading the os module has nothing to do with this. –Martijn Pieters♦ Sep 27 '13 at 20:54 Aah, okay. Yeah I read in one of the python docs that os.environ is set only when the os module is loaded and I thought that might have something to do with that. –Mars J Sep 27 '13 at 20:56 1 os.path.getmtime() doesn't cache anything. It simply returns os.stat(filename).st_mtime. os.stat() doesn't cache anything, it simply calls into the C library, which asks the OS for that info. –Martijn Pieters♦ Sep 27 '13 at 20:59 What operating system are you using? I recall that some OSes delay updating mtime until after the file is closed. –Robᵩ Sep 27 '13 at 20:59 I am developing
module implements some useful functions on pathnames. To read or write files see open(), and for accessing the filesystem see the os module. Note On Windows, many of python move file these functions do not properly support UNC pathnames. splitunc() and ismount() do handle them correctly. Unlike a unix shell, Python does not do any automatic path expansions. Functions such python list files in directory as expanduser() and expandvars() can be invoked explicitly when an application desires shell-like path expansion. (See also the glob module.) Note Since different operating systems have different http://stackoverflow.com/questions/19059877/python-os-path-getmtime-time-not-changing path name conventions, there are several versions of this module in the standard library. The os.path module is always the path module suitable for the operating system Python is running on, and therefore usable for local paths. However, you can also import and use the individual modules if you want to manipulate a path that is always in one of https://docs.python.org/2/library/os.path.html the different formats. They all have the same interface: posixpath for UNIX-style paths ntpath for Windows paths macpath for old-style MacOS paths os2emxpath for OS/2 EMX paths os.path.abspath(path)¶ Return a normalized absolutized version of the pathname path. On most platforms, this is equivalent to calling the function normpath() as follows: normpath(join(os.getcwd(), path)). New in version 1.5.2. os.path.basename(path)¶ Return the base name of pathname path. This is the second element of the pair returned by passing path to the function split(). Note that the result of this function is different from the Unix basename program; where basename for '/foo/bar/' returns 'bar', the basename() function returns an empty string (''). os.path.commonprefix(list)¶ Return the longest path prefix (taken character-by-character) that is a prefix of all paths in list. If list is empty, return the empty string (''). Note that this may return invalid paths because it works a character at a time. os.path.dirname(path)¶ Return the directory name of pathname path. This is the first element of the pair returned by passing path
Sign in https://github.com/ARM-software/workload-automation/issues/183 Pricing Blog Support Search GitHub This repository Watch 20 Star 35 Fork 35 ARM-software/workload-automation Code Issues 12 http://www.thomas-cokelaer.info/tutorials/python/module_os.html Pull requests 6 Projects 0 Wiki Pulse Graphs New issue WA hits python error under 32-bit ubuntu OS error from with python2.7 #183 Closed cloverpop opened this Issue Jun 20, 2016 · 5 comments Projects None yet Labels None yet Milestone No milestone Assignees No one assigned 3 participants cloverpop commented Jun 20, 2016 error from calling 2016-06-20 15:16:09,738 DEBUG android: adb -s 10.164.4.23:5555 pull '/sdcard/wa-working/cpufreq.tar.gz' 'wa_output/idle_big_big_idle_state0_1_1/cpufreq.tar.gz' 2016-06-20 15:16:10,042 ERROR instrumentation: Error in insturment cpufreq 2016-06-20 15:16:10,044 ERROR instrumentation: File "/usr/local/lib/python2.7/dist-packages/wlauto/core/instrumentation.py", line 240, in call 2016-06-20 15:16:10,044 ERROR instrumentation: self.callback(context) 2016-06-20 15:16:10,044 ERROR instrumentation: File "/usr/local/lib/python2.7/dist-packages/wlauto/instrumentation/misc/init.py", line 166, in update_result 2016-06-20 15:16:10,044 ERROR instrumentation: tf.extractall(context.output_directory) 2016-06-20 15:16:10,044 ERROR instrumentation: File "/usr/lib/python2.7/tarfile.py", line 2079, in extractall 2016-06-20 15:16:10,044 ERROR instrumentation: self.extract(tarinfo, path) 2016-06-20 15:16:10,044 ERROR instrumentation: File "/usr/lib/python2.7/tarfile.py", line 2116, in extract 2016-06-20 15:16:10,044 ERROR instrumentation: self._extract_member(tarinfo, os.path.join(path, tarinfo.name)) 2016-06-20 15:16:10,044 ERROR instrumentation: File "/usr/lib/python2.7/tarfile.py", line 2209, in _extract_member 2016-06-20 15:16:10,044 ERROR instrumentation: self.utime(tarinfo, targetpath) 2016-06-20 15:16:10,044 ERROR instrumentation: File "/usr/lib/python2.7/tarfile.py", line 2330, in utime 2016-06-20
as sys) and os.path that are dedicated to the system and directories; respectively. Whenever possible, you should use the functions provided by these modules for file, directory, and path manipulations. These modules are wrappers for platform-specific modules, so functions like os.path.split work on UNIX, Windows, Mac OS, and any other platform supported by Python. See also These shutil, tempfile, glob modules from the Python documentation. 7.1. Quick start¶ You can build multi-platform path using the proper separator symbol: >>> import os >>> import os.path >>> os.path.join(os.sep, 'home', 'user', 'work') '/home/user/work' >>> os.path.split('/usr/bin/python') ('/usr/bin', 'python') 7.2. Functions¶ The os module has lots of functions. We will not cover all of them thoroughly but this could be a good start to use the module. 7.2.1. Manipulating Directories¶ The getcwd() function returns the current directory (in unicode format with getcwdu() ). The current directory can be changed using chdir(): os.chdir(path) The listdir() function returns the content of a directory. Note, however, that it mixes directories and files. The mkdir() function creates a directory. It returns an error if the parent directory does not exist. If you want to create the parent directory as well, you should rather use makedirs(): >>> os.mkdir('temp') # creates temp directory inside the current directory >>> os.makedirs(/tmp/temp/temp") Once created, you can delete an empty directory with rmdir(): >>> import os >>> os.mkdir('/tmp/temp') >>> os.rmdir('/tmp/temp') You can remove all directories within a directory (if there are not empty) by using os.removedirs(). If you want to delete a non-empty directory, use shutil.rmtree() (with cautious). 7.2.2. Removing a file¶ To remove a file, use os.remove(). It raise the OSError exception if the file cannot be removed. Under Linux, you can also use os.unlink(). 7.2.3. Renaming files or directories¶ You can rename a file from an old name to a new one by using os.rename(). See also os.renames(). 7.2.4. Permission¶ you can change the mode of a file using chmod(). See also chown, chroot, fchmod, fchown. The os.access() verifies the access permission specified in the mode argument. Returns