On Nov 10, 2008, at 2:44 PM, Zane Selvans wrote:
How are you creating your list? You need to make sure that each
instance creates its very own list object, something like:
self.foo = []
rather than grabbing a reference to some shared list instance, such as
one defined as a default argument to your __init__ method.
HTH,
- Joe
However, one (and only one) of these instance variables is behaving
mysteriously like a class variable: all instances of the class are
sharing a single copy of the variable, located at the same place in
memory.
>
Is there a common mistake that can result in this behavior, that
doesn't involve using class variables - I really have absolutely
nothing defined in the class except for methods. The problem shows
up regardless of how I name the instance variables (i.e. using name
mangling __names or not). The problematic variable consists of a
list of objects of type Lineament (the same object class as the one
that's giving me problems).
mysteriously like a class variable: all instances of the class are
sharing a single copy of the variable, located at the same place in
memory.
>
Is there a common mistake that can result in this behavior, that
doesn't involve using class variables - I really have absolutely
nothing defined in the class except for methods. The problem shows
up regardless of how I name the instance variables (i.e. using name
mangling __names or not). The problematic variable consists of a
list of objects of type Lineament (the same object class as the one
that's giving me problems).
instance creates its very own list object, something like:
self.foo = []
rather than grabbing a reference to some shared list instance, such as
one defined as a default argument to your __init__ method.
HTH,
- Joe