[Tutor] Filesystem Usage

[Steve Nelson]

On 9/22/06, Steve Nelson <sanelson at gmail.com> wrote:

> In the end I just did:
>
> def fsUsage(dir):
>   """Returns the % usage of a given filesystem"""
>   stat = os.statvfs(dir)
>   from statvfs import F_BLOCKS, F_BFREE
>   total = stat[F_BLOCKS]
>   avail = stat[F_BFREE]
>   used = total-avail
>   percent = used/total*100
>   return percent

Can someone explain how I manged to import F_BLOCKS and F_BFREE?

I want to do the same with pwd and grp:

>>> gstat = grp.getgrgid(1)
>>> dir(gstat)
['__add__', '__class__', '__contains__', '__delattr__', '__doc__',
'__eq__', '__ge__', '__getattribute__', '__getitem__', '__getslice__',
'__gt__', '__hash__', '__init__', '__le__', '__len__', '__lt__',
'__mul__', '__ne__', '__new__', '__reduce__', '__reduce_ex__',
'__repr__', '__rmul__', '__setattr__', '__str__', 'gr_gid', 'gr_mem',
'gr_name', 'gr_passwd', 'n_fields', 'n_sequence_fields',
'n_unnamed_fields']

>>> gstat[0]
'staff'
>>> gstat[GR_GID]
Traceback (most recent call last):
  File "<stdin>", line 1, in ?
NameError: name 'GR_GID' is not defined

What's the difference?

It just seems that specifying the location in the tuple is not very
clear or self-documenting, and using GR_GID is better.

S.
> S.
> >
> > hope this helps a little!
> > -- wesley
> > - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
> > "Core Python Programming", Prentice Hall, (c)2007,2001
> >     http://corepython.com
> >
> > wesley.j.chun :: wescpy-at-gmail.com
> > python training and technical consulting
> > cyberweb.consulting : silicon valley, ca
> > http://cyberwebconsulting.com
> >
>