[IronPython] A pseudobug in standard library usage

[Michael Foord]

Mohammad Tayseer wrote:
> The builtin module "nt" has no method called "_getfullpathname", which 
> the stdlib uses to detect if the OS is Windows (that's what the 
> comment says). I don't know why the library writer didn't check for 
> sys.platform. 
Because it uses the '_getfullpathname' if it is available.

Inside the 'abspath' function (which uses '_getfullpathname') is an 
explicit check, which returns the current directory for an empty path:

        if path: # Empty path must return current working directory.
            try:
                path = _getfullpathname(path)
            except WindowsError:
                pass # Bad path - return unchanged.
        else:
            path = os.getcwd()

I think this is *designed* to work for an empty string - but *happens* 
to work for None as well.

Either way, it could be fixed if the built-in nt module supplied 
'_getfullpathname'.

Thanks

Michael
http://www.voidspace.org.uk/ironpython/index.shtml


> I think that running CPython on Linux will result in an exception
>
> There are two issues here: IronPython work item & CPython stdlib bug
>
> */Dave Fugate <dfugate at microsoft.com>/* wrote:
>
>     Thanks Michael! This has been filed as CodePlex Work Item #10710
>     (http://www.codeplex.com/IronPython/WorkItem/View.aspx?WorkItemId=10710).
>
>     -----Original Message-----
>     From: users-bounces at lists.ironpython.com
>     [mailto:users-bounces at lists.ironpython.com] On Behalf Of Michael Foord
>     Sent: Friday, June 01, 2007 7:13 AM
>     To: Discussion of IronPython
>     Subject: [IronPython] A pseudobug in standard library usage
>
>     Hello all,
>
>     More fun with None, this time with the standard library - specifically
>     with 'os.path.abspath':
>
>     CPython:
>
>     >>> import os
>     >>> os.path.abspath(None)
>     'C:\\Program Files\\Python24'
>     >>>
>
>     IronPython:
>     >>> import os
>     >>> os.path.abspath(None)
>     Traceback (most recent call last):
>     File , line 0, in ##89
>     File C:\Program Files\Python24\Lib\ntpath.py, line 491, in abspath
>     File C:\Program Files\Python24\Lib\ntpath.py, line 53, in isabs
>     File C:\Program Files\Python24\Lib\ntpath.py, line 119, in splitdrive
>     AttributeError: 'NoneType' object has no attribute '__getitem__'
>     >>>
>
>     Thanks
>
>     Michael
>
>     --
>     Michael Foord
>     Resolver Systems
>     michael.foord at resolversystems.com
>
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>
> Mohammad Tayseer
> http://spellcoder.com/blogs/tayseer
>
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