Peng Yu wrote:
On Tue, Nov 17, 2009 at 8:25 PM, Benjamin Kaplan
<benjamin.kap...@case.edu> wrote:
On Tue, Nov 17, 2009 at 9:18 PM, Peng Yu <pengyu...@gmail.com> wrote:
It's not clear to me whether WindowsError is available on linux or
not, after I read the document. But I see WindowsError in shutil.py.
Could you somebody let me know what cause the following error?
try:
... raise WindowsError('WindowsError')
... except WindowsError as e:
... print e
...
Traceback (most recent call last):
File "<stdin>", line 3, in <module>
NameError: name 'WindowsError' is not defined
--
does this answer your question?
Python 2.6.4 (r264:75706, Oct 28 2009, 23:01:00)
[GCC 4.2.1 (Apple Inc. build 5646) (dot 1)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
import shutil
print shutil.WindowsError
None
But the document doesn't say shutil need to be imported in order to
use WindowsError. Shall the document or the code be corrected?
http://docs.python.org/library/exceptions.html
The WindowsError is available in a Windows build, and I don't directly
know if it's available on Linux.
I think shutil is a red-herring here, however. The docs show the
implementation of copyTree(), and that function uses WindowsError.
However, earlier in the shutil.py file, there is the following trick:
try:
WindowsError
except NameError:
WindowsError = None
This has the effect of defining a dummy attribute "WindowsError" WITHIN
THIS ONE MODULE, if it's not already in the global namespace. This lets
the code
in function copytree() deal with an OSError differently on Windows than
in other systems.
I do not expect that the name WindowsError of that module was intended
to be accessed by user's code. And because some of you see a None
value, that tells me that it is indeed not defined for some systems.
I think that fact should be documented in the URL you mention,
exceptions.html
But in the meantime, if you're not on a Windows system, you won't see
that exception, and if you need to be portable, you may pull the same
trick that shutil did.
DaveA
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