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Introducing __reduce_ex__, which is called with a protocol number argument

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if it exists in preference over __reduce__.  Now Tim can go implement this
in cPickle.c.
This commit is contained in:
Guido van Rossum 2003-02-18 22:05:12 +00:00
parent 2b0643a95d
commit c53f009f94
4 changed files with 36 additions and 19 deletions
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29
Lib/pickle.py
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@ -304,21 +304,20 @@ class Pickler:
# Check copy_reg.dispatch_table
reduce = dispatch_table.get(t)
if not reduce:
# Check for a __reduce__ method.
# Subtle: get the unbound method from the class, so that
# protocol 2 can override the default __reduce__ that all
# classes inherit from object. This has the added
# advantage that the call always has the form reduce(obj)
reduce = getattr(t, "__reduce__", None)
if self.proto >= 2:
# Protocol 2 can do better than the default __reduce__
if reduce is object.__reduce__:
reduce = _better_reduce
if not reduce:
raise PicklingError("Can't pickle %r object: %r" %
(t.__name__, obj))
rv = reduce(obj)
if reduce:
rv = reduce(obj)
else:
# Check for a __reduce_ex__ method, fall back to __reduce__
reduce = getattr(obj, "__reduce_ex__", None)
if reduce:
rv = reduce(self.proto)
else:
reduce = getattr(obj, "__reduce__", None)
if reduce:
rv = reduce()
else:
raise PicklingError("Can't pickle %r object: %r" %
(t.__name__, obj))
# Check for string returned by reduce(), meaning "save as global"
if type(rv) is StringType: