della wrote:
> On 27 Nov, 21:34, Terry Reedy <[EMAIL PROTECTED]> wrote:
>
>> > But in the interpreters module dict, foo it is, and stays.
>>
>> But giving the modules different names on the disk should work, no?
>
> Yes, but -- for what I've understood -- that wouldn't solve my
> original problem with pickle, since I would need to carry around a
> module with the new name forever :)
You can rename the globals within the pickle. A starting point, not tested
beyond running the demo script:
$ cat fixpickle.py
import pickle
import pickletools
def ops(d):
prevpos = None
previnfo = None
for info, arg, pos in pickletools.genops(d):
if prevpos is not None:
yield d[prevpos:pos]
prevpos = pos
previnfo = info
yield d[prevpos:]
def tocode(dotted):
parts = tuple(dotted.rsplit(".", 1))
return "c%s\n%s\n" % parts
def rename_globals(d, pairs):
updates = dict((tocode(old), tocode(new)) for old, new in pairs)
return "".join(updates.get(o, o) for o in ops(d))
$ cat alpha.py
class A(object):
def __init__(self, x, y):
self.x = x
self.y = y
def __str__(self):
return "A(%s, %s)" % (self.x, self.y)
$ cat beta.py
class B(object):
def __str__(self):
return "B(%s, %s)" % (self.x, self.y)
$ cat demo.py
import alpha
import fixpickle
import pickle
if __name__ == "__main__":
a = alpha.A(1, 2)
print a
d = pickle.dumps(a)
d = fixpickle.rename_globals(d, [("alpha.A", "beta.B")])
b = pickle.loads(d)
print b
Peter
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