s = shelve.open(blah), s.items() Attribute Error

[Steve Purcell]

Jeff Blaine wrote:
> It seems that shelf objects do not have an .items() method like
> normal dictionary objects.
> 
> Is this true?

You're right, according to the source.

> If so, it should probably be pointed out in the docs under 'Restrictions'
> for shelve.  And also, is there a reason?

Probably an omission on the part of the author, or it might be considered an
undesirable operation, since it is equivalent to slurping everything out of
the shelf file.

You can try something like:

  s = shelve.open(blah, 'c')
  i = map(s.__getitem__, s.keys())

to get the same effect, but that raw reference to '__getitem__' is bad form.

Best to stick with:

  s = shelve.open(blah, 'c')
  i = map(lamba s=s, k: s[k], s.keys())

or simply:

  s = shelve.open(blah, 'c')
  i = []
  for k in s.keys():
    i.append(s[k])


-Steve

-- 
Steve Purcell,  Technical Director, Inkontact
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