March 2003
Intermediate to advanced
656 pages
39h 30m
English
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Name
pickle
Synopsis
pickle(type,fred,fcon=None)
Registers function fred as the reduction
function for type type, where
type must be a type object (not a class).
To save any object o of type
type, module pickle
calls
fred
(
o
)
and saves fred’s result.
fred
(
o
)
must return a pair
(
fcon,t
)
or a tuple
(
fcon,t,d
),
where fcon is a safe constructor and
t is a tuple. To reload
o, pickle calls
o
=
fcon
(*
t
).
Then, if fred returned a
d, pickle uses
d to restore
o’s state, as in
“Pickling of instance objects”
(o
.__setstate__(
d
) if
o supplies __setstate__, otherwise o
.__dict__.update(
d
)).
If fcon is not None,
pickle also calls
constructor(
fcon
)
to register fcon as a safe
constructor.