import ntpath

pname = "C:\\apps\\jython-dev\\dist\\Lib\\site-packages\\"
print ntpath.isdir( pname )

'''
test result:

C:\apps\jython-dev>python ntpathbug.py
True

C:\apps\jython-dev>jython ntpath.py
Traceback (most recent call last):
  (no code object) at line 0
IOError: [Errno 2] File not found - C:\apps\jython-dev\ntpath.py (???????????)

C:\apps\jython-dev>python --version
Python 2.5.1

C:\apps\jython-dev>jython --version
Jython 2.5a1+ (trunk, กใ?????? 22 2008, 23:20:10)
[Java HotSpot(TM) Client VM (Sun Microsystems Inc.)] on java1.6.0_04

'''

'''
Creating C:\apps\jython-dev\dist\Lib\site-packages\
error: C:\apps\jython-dev\dist\Lib\site-packages\: couldn't make directories
Traceback (most recent call last):
  File "setup.py", line 75, in <module>
    setup(
  File "C:\apps\jython-dev\dist\Lib\distutils\core.py", line 151, in setup
    dist.run_commands()
  File "C:\apps\jython-dev\dist\Lib\distutils\dist.py", line 974, in run_command
s
    self.run_command(cmd)
  File "C:\apps\jython-dev\dist\Lib\distutils\dist.py", line 994, in run_command

    cmd_obj.run()
  File "C:\apps\jython-dev\dist\Lib\distutils\command\install.py", line 517, in
run
    self.run_command(cmd_name)
  File "C:\apps\jython-dev\dist\Lib\distutils\cmd.py", line 333, in run_command
    self.distribution.run_command(command)
  File "C:\apps\jython-dev\dist\Lib\distutils\dist.py", line 994, in run_command

    cmd_obj.run()
  File "C:\apps\jython-dev\dist\Lib\distutils\command\install_egg_info.py", line
 41, in run
    self.execute(os.makedirs, (self.install_dir,),
  File "C:\apps\jython-dev\dist\Lib\distutils\cmd.py", line 358, in execute
    util.execute(func, args, msg, dry_run=self.dry_run)
  File "C:\apps\jython-dev\dist\Lib\distutils\util.py", line 347, in execute
    apply(func, args)
  File "C:\apps\jython-dev\dist\Lib\os.py", line 314, in makedirs
    raise OSError(0, "couldn't make directories", path)
OSError: [Errno 0] couldn't make directories: 'C:\\apps\\jython-dev\\dist\\Lib\\
site-packages\\'

'''