On 16/09/2010 01:13, Jason Swails wrote:
Hello everyone,
I'm encountering an issue in one of my Python classes that makes
extensive use of dictionaries. I was under the impression that each
time an object was instantiated, all of its variables were created in a
new section of memory, so that if you change the value of the variable
in one instance, it left that variable's value in another instance
alone. In the object that I wrote, I have 3 different dictionaries:
parm_data, pointers, and formats, all defined in the same place. When I
load 2 instances of this object, parm_data and formats each take on
different values between the two objects (as they should), but for some
reason pointers does not. I've seen this problem with python2.6.4 and
2.6.1 (and I believe earlier versions as well, but I'm not sure). I've
attached a tarball with the relevant code and a sample script that shows
what I mean.
If anyone can tell me why the dictionary from 2 different objects are
exactly the same for pointers, but are different for, e.g. parm_data and
formats, that would be greatly appreciated.
When you bind to a name in the class namespace:
class Example:
foo = "class attribute"
the name is an attribute of the class.
If you want a name to be an attribute of an instance then you should
refer to the instance explicitly:
class Example:
def __init__(self):
self.bar = "instance attribute"
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