Class v. Instance variables in Python

[Zane Selvans]

I have defined a class called Lineament, which has no class variables  
- only instance variables, defined and set within __init__(), and  
later potentially modified by other class methods.

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).

Thanks for any suggestions... sorry I didn't include example code.  I  
haven't been able to boil it down to a minimal example yet.

Zane

--
Zane Selvans
Amateur Earthling
zane at ideotrope.org
303/815-6866
http://zaneselvans.org
PGP Key: 55E0815F








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