Earlier, I said:
> I'll look into what the standard Python doc set says on this
> matter.
>
RTFM, in section "Augmented assignment statements" of python301.chm:
---
For targets which are attribute references, the initial value is retrieved with
a getattr() and the result is assigned with a setattr(). Notice that the two
methods do not necessarily refer to the same variable. When getattr() refers to
a class variable, setattr() still writes to an instance variable. For example:
class A:
x = 3 # class variable
a = A()
a.x += 1 # writes a.x as 4 leaving A.x as 3
---
So, this case is closed ... almost. I believe a similar explanation, with a
similar example, should appear in the preceding/parent section, "Assignment
statements". Here's my proposed example:
class A:
x = 3 # class variable
a = A()
a.x = a.x + 1 # a.x on RHS gets value of class variable (3)
# a.x on LHS creates instance variable with
value of RHS expression (4)
Others' thoughts on this?
-John
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