On Tue, 29 Sep 2009 16:03:46 +1000, Chris Adamson wrote:
> Hello,
>
> I am writing code that cycles through files in a directory and for each
> file it writes out another file with info in it. It appears that as I am
> iterating through the list returned by os.listdir it is being updated
> with the new files that are being added to the directory. This occurs
> even if I reassign the list to another variable.
>
> Here is my code:
>
> fileList = os.listdir(temporaryDirectory)
>
> for curFile in fileList:
> # print the file list to see if it is indeed growing
> print FileList
> fp = file(os.path.join(temporaryDirectory, "." + curFile), 'w')
> # write stuff
> fp.close()
Are you sure this is your code you're using? Where is FileList defined?
It's not the same as fileList.
What you describe is impossible -- os.listdir() returns an ordinary list,
it isn't a lazy iterator that updates automatically as the directory
changes. (At least not in Python2.5 -- I haven't checked Python 3.1.)
This is what happens when I try it:
>>> import os
>>> os.listdir('.')
['a', 'c', 'b']
>>> filelist = os.listdir('.')
>>> for curFile in filelist:
... print filelist
... fp = file(os.path.join('.', "."+curFile), 'w')
... fp.close()
...
['a', 'c', 'b']
['a', 'c', 'b']
['a', 'c', 'b']
I think the bug is in your code -- you're probably inadvertently updating
fileList somehow.
--
Steven
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