Issue574546

In my application there is a line like

  item.attribute += "value"

which doesn't work. The attribute is looked up with
the __getattr__ method as item is a wrapper around a
Java object.

So this is effectively equivalent to

  item.__getattr__("attribute").__iadd__("value")

When I replace the above line with

  item.attribute.__iadd__("value")

it works fine. I noticed that the original version causes
a call to

  item.__setattr__(None)

(or something else instead of None) which is not to be
expected.
The problem went away when I commented out line 1293
of org/python/compiler/CodeCompiler.java  rev. 2.28.
That line must be useless (so by definition incorrect)
as the augbinop already does the store itself.

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user_id=4201

This is not a bug. The result of augmented assignment
operator must be rebound back as a attribute or index or
name. It is not acceptable to depend solely on the __iadd__
to modify the attribute.