Maurice LING wrote:
> Sorry for not specifying clearly enough. Given that copy_reg lets you
> specify arbitrary code to serialize arbitrary objects, of which some are
> taken care of by pickle, in the set of possible Python types,
the types module contains a selection of type objects; the set of possible
types that you may have in a Python program is unbounded.
> What types cannot be serialized by pickle (besides CodeType) and
> requires handling using copy_reg?
import types, pickle, sys
for t in dir(types):
try:
if t == "BufferType":
o = buffer("hello")
elif t == "EllipsisType":
o = Ellipsis
elif t == "FileType":
o = file("hello.txt", "w")
elif t == "NoneType":
o = None
elif t == "SliceType":
o = slice(0,0,0)
elif t == "XRangeType":
o = xrange(0,0,1)
else:
o = getattr(types, t)()
except:
print t, "FAILED:", sys.exc_value
else:
try:
s = pickle.dumps(o)
except:
print t, "FAILED:", str(sys.exc_value).upper()
else:
print t, "OK"
should give you an idea (feel free to add more object factories)
</F>
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