I forgot to include a few cases:
(1) Inspired by your calling the class attributes "templates":
class Demo3(object):
pass
d = Demo3()
print d.non_template # raises exception
d.non_template = 45
print d.non_template
print Demo3.non_template # raises exception
Demo3.non_template = 44
print d.non_template
print Demo3.non_template # raises exception
del d.non_template
print d.non_template
del d.non_template # raises exception
print d.non_template
del Demo3.non_template
print d.non_template # raises exception
All the above to demonstrate the class storage and instance storage
are separate.
(2) Trickier stuff involving sharing:
class Demo4(object):
common = []
g = Demo4()
h = Demo4()
g.common.append('a')
print g.common, h.common, Demo4.common
g.common = g.common
Demo4.common = Demo4.common + ['b']
h.common = h.common
x = Demo4()
g.common.append('c')
h.common.append('d')
x.common.append('e')
print g.common, h.common, Demo4.common, x.common
Thanks for your reply and examples BTW (I think) they are helping me
clarify my understanding of python classes and the language used to
describe them.
They are meant to point out that you need to read language definitions
carefully, or you will breeze by thinking you understand something you
really do not understand. Python provides a great way to experiment
with things you think you get; try "corner cases" to make sure you
know what is going on.
--Scott David Daniels
[EMAIL PROTECTED]
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