newbie

wes weston wweston at att.net
Thu Aug 19 17:46:12 CEST 2004


JASON JESSO wrote:
> I'm trying to add a mode to a mkdir program a got off
> the python cookbook.
> 
> The error I get is:
> ./mkdir.py jason 0777
> Traceback (most recent call last):
>   File "./mkdir.py", line 31, in ?
>     _mkdir( sys.argv[1], sys.argv[2] )
>   File "./mkdir.py", line 25, in _mkdir
>     os.mkdir( newdir, mode )
> TypeError: an integer is required
> 
> When I convert the mode from a string to an octal with
> oct(int(sys.argv[2])) the permissions are all screwed
> up.
> 
> Any help?
> 
> #!/usr/bin/env python
> 
> import sys, os
> 
> def _mkdir( newdir, mode ):
>     """works the way a good mkdir should :)
>         - already exists, silently complete
>         - regular file in the way, raise an exception
>         - parent directory(ies) does not exist, make
> them as well
>     """
>     if os.path.isdir( newdir ):
>         pass
>     elif os.path.isfile( newdir ):
>         raise OSError("a file with the same name as
> the desired " \
>                       "dir, '%s', already exists." %
> newdir)
>     else:
>         head, tail = os.path.split( newdir )
>         if head and not os.path.isdir( head ):
>             _mkdir( head, mode )
> 
>         if tail:
>             if mode is None:
>                  os.mkdir( newdir )
>             else:
>                  os.mkdir( newdir, mode )
> 
> if __name__ == '__main__' :
>     if len(sys.argv) < 3:
>        _mkdir( sys.argv[1], None )
>     else:
>        _mkdir( sys.argv[1], sys.argv[2] )
> 

jason,
    Your first instinct in direct problems like this
should be to get in the python interactive interpreter
and play around.


Python 2.3.3 (#1, Mar 11 2004, 22:02:41)
[GCC 3.2.3 20030502 (Red Hat Linux 3.2.3-20)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
 >>> perm = "0777"
 >>> oct(int(perm))
'01411'
 >>>


Note you still need to import.

 >>> print math.pi
Traceback (most recent call last):
   File "<stdin>", line 1, in ?
NameError: name 'math' is not defined
 >>> import math
 >>> print math.pi
3.14159265359
 >>>

wes




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