On Tue, 27 Feb 2007 20:31:43 -0800, Scott David Daniels wrote:
>> def findallfiles(self, base):
>> self.results = []
>> for root,dirs,files in os.walk(base):
>> os.chdir(root)
> ^^^ Mistake here, don't change directories during os.walk ^^^
I came across this problem some time ago. I had to walk a directory tree,
calling an external program on each file. Unfortunately, that external
program wrote directly to the current working directory, which caused all
sorts of havoc. This is how I dealt with it:
def unbin(where):
"""Walk through a directory tree, calling macunpack to extract the
contents of MacBinary files.
"""
def _unbin(data, dirname, files):
for oldname in files:
fullname = os.path.normpath(os.path.join(dirname, oldname))
if os.path.isfile(fullname):
# Dammit, macunpack writes directly to the current
# working directory. Changing the cwd breaks the file
# tree walker, so we have to remember the current
# directory, change it to where we want to be, then
# change it back.
wd = os.getcwd()
os.chdir(dirname)
result = os.system('macunpack -f "%s"' % oldname)
if result == 0:
# Unpacking worked, so delete the original.
os.remove(oldname)
os.chdir(wd) # sigh...
os.path.walk(where, _unbin, None)
Is there another (better) way of dealing with this sort of situation?
--
Steven D'Aprano
--
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