[Numpy-discussion] Pickling and initializing
Robert Kern
robert.kern@gmail....
Mon Mar 3 17:36:12 CST 2008
On Mon, Mar 3, 2008 at 5:29 PM, Dinesh B Vadhia
<dineshbvadhia@hotmail.com> wrote:
>
>
> When you pickle a numpy/scipy matrix does it have to be initialized by
> another program? For example:
>
> Program One:
> A = scipy.asmatrix(scipy.empty((i, i)), dtype=int) # initialize
> matrix A
> <do something with A>
> pickle.dump(A)
>
> Program Two:
> pickle.load(A)
>
>
> ... in Program Two, do we need the statement:
>
> A = scipy.asmatrix(scipy.empty((i, i)), dtype=int) # initialize
> matrix A
>
> before the pickle.load(A)?
No. Neither pickle.load() nor pickle.dump() work like that. The
signature of pickle.dump() is
pickle.dump(f, obj)
and the signature of pickle.load() is
obj = pickle.load(f)
where `f` is an open file object. There is no need to "pre-declare"
`obj` before loading it.
> If not, why not and doesn't this make documentation difficult?
Not particularly, no.
--
Robert Kern
"I have come to believe that the whole world is an enigma, a harmless
enigma that is made terrible by our own mad attempt to interpret it as
though it had an underlying truth."
-- Umberto Eco
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