Python IOError exception when creating a long file
I get an IOError shown below when trying to open a new file using "open (fname, 'w+')". The complete error message is below.
The file does not exist, but I verified using "os.access(dir_name, os.W_OK)" and "os.path.exists (dir_name)" that the parent directory for the file does exist.
I am wondering if the file name is just too long for Windows, or if I am doing something wrong. Any tips would be appreciated. Thank you very much.
Error message:
IOError: [Errno 2] No such file or directory: 'C:Documents and SettingsAdministratorop_modelsCorp_Network_Nov12abcde_corporate_nov_12.projectabcde_corporate_nov_12-ctr.rptd.dirctrNon Business Hours for Weeknightshourly_data_for_2_weeks1294897740json.dataLink Link Utilizationanalyzer393146160-data0.js'
In the Windows API the maximum path length is limited to 260 characters.
http://msdn.microsoft.com/en-us/library/aa365247%28v=vs.85%29.aspx
Update: prepend "?" to the path.
你可以用这个来修补tarfile模块：
import tarfile
def monkey_patch_tarfile():
import os
import sys
if sys.platform not in ['cygwin', 'win32']:
return
def long_open(name, *args, **kwargs):
# http://msdn.microsoft.com/en-us/library/aa365247%28v=vs.85%29.aspx#maxpath
if len(name) >= 200:
if not os.path.isabs(name):
name = os.path.join(os.getcwd(), name)
name = "\?" + os.path.normpath(name)
return long_open.bltn_open(name, *args, **kwargs)
long_open.bltn_open = tarfile.bltn_open
tarfile.bltn_open = long_open
monkey_patch_tarfile()
Here is some related code which works for me (I have very long file names and paths):
for d in os.walk(os.getcwd()):
dirname = d[0]
files = d[2]
for f in files:
long_fname = u"\?" + os.getcwd() + u"" + dirname + u"" + f
if op.isdir(long_fname):
continue
fin = open(long_fname, 'rb')
...
Note that for me it only worked with a combination of all of the following:
Prepend '?' at the front.
Use full path, not relative path.
Use only backslashes.
In Python, the filename string must be a unicode string, for example u"abc", not "abc".
Also note, for some reason os.walk(..) returned some of the directories as files, so above I check for that.
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