"Michael Pardee" <python-l...@open-sense.com> wrote in message
news:mailman.22.1266722722.4577.python-l...@python.org...
I'm relatively new to python and I was very surprised by the following
behavior:
a=1
b=2
mylist=[a,b]
print mylist
[1, 2]
a=3
print mylist
[1, 2]
Whoah! Are python lists only for literals? Nope:
c={}
d={}
mydlist=[c,d]
print mydlist
[{}, {}]
c['x']=1
print mydlist
[{'x': 1}, {}]
So it looks like variables in a list are stored as object references.
This seems to confirm that:
mydlist[1]['y']=4
print mydlist
[{}, {'y': 4}]
So I figure my initial example doesn't work because if you assign a
That shows a different outlook. I would have said your first example works
as expected and it was the second example that was strange, possibly due to
shallow instead of deep copies by Python.
--
Bartc
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