The option writeback=True seems to work:
# put something in the shelve
import shelve
class C(object):
pass
s = shelve.open("x.shelve")
s["x"] = C()
s.close()
# read it
s = shelve.open("x.shelve", writeback=True)
c = s["x"]
c.attr = 1
print s["x"].attr # => 1
s.close()
Michele
class x: pass
z = x()
z.a = 'a'
d = {'a': z}
for i in range(5):
print id(d['a'])
prints the same id 5 times as you'd expect.
d = shelve('filename')
d['a'] = z
for i in range(5):
print id(d['a'])
prints five different id's. So, for example,
y = d['
