[Tutor] os.symlink can't find target

[Mark Lawrence]

On 24/02/2014 16:36, Peter Otten wrote:
> Bob Williams wrote:
>
>> -----BEGIN PGP SIGNED MESSAGE-----
>> Hash: SHA1
>>
>> My operating system is Linux (openSUSE 13.1).
>>
>> I'm trying to create symlinks. The following code:
>>
>> if pathList[j][-3:] == "mp3":
>>      linkName1 = pathList[j][0:-3] + "mp3"
>>      linkName2 = destPath + linkName1[len(sourcePath):]
>>      print 'Creating link %s -> %s' % (linkName2, pathList[j])
>>      os.symlink(pathList[j], linkName2)
>>
>> fails with this error:
>>
>>
>> Creating link /pollux/music/portable/testing/artists/Death in
>> June/1995 Rose Clouds Of Holocaust/10 Lifebooks.mp3 ->
>> /home/bob/music/artists/Death in June/1995 Rose Clouds Of Holocaust/10
>> Lifebooks.mp3
>> Traceback (most recent call last):
>>    File "/home/bob/Documents/scripts/python/flac2mp3.py", line 101, in
>> <module>
>>      os.symlink(pathList[j], linkName2)
>> OSError: [Errno 2] No such file or directory
>>
>> The same thing happens in ipython, when I type the paths in manually.
>> I have tried escaping the spaces with '\', but the same error is
>> generated.
>>
>> The file "/home/bob/music/artists/Death in June/1995 Rose Clouds Of
>> Holocaust/10 Lifebooks.mp3" definitely exists.
>>
>> Thanks,
>
> os.symlink(existing_file, symlink_to_create)
>
> fails with that error if the directory that shall contain the new symlink
> does not exist. You can create it before making the symlink with
>
> try:
>      os.makedirs(os.path.dirname(symlink_to_create))
> except OSError as err:
>      # Assume the directory exists.
>      # A thorough coder would check the errno here
>      pass
>

Python 3.3+ allows finer grained error handling than that shown above, 
so you could catch FileExistsError, see 
http://legacy.python.org/dev/peps/pep-3151/ for the details.

-- 
My fellow Pythonistas, ask not what our language can do for you, ask 
what you can do for our language.

Mark Lawrence

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