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  possible \emph{in-place} behavior, the binary operation performed by
  augmented assignment is the same as the normal binary operations.
  
+ For targets which are attribute references, the initial value is
+ retrieved with a \method{getattr()} and the result is assigned with a
+ \method{setattr()}.  Notice that the two methods do not necessarily
+ refer to the same variable.  When \method{getattr()} refers to a class
+ variable, \method{setattr()} still writes to an instance variable.
+ For example:
+ 
+ \begin{verbatim}
+ class A:
+     x = 3    # class variable
+ a = A()
+ a.x += 1     # writes a.x as 4 leaving A.x as 3
+ \end{verbatim}
+ 
  
  \section{The \keyword{pass} statement \label{pass}}
  \stindex{pass}