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Wed Aug 9 18:35:13 CEST 2006 · https://mail.python.org/pipermail/python-dev/2006-August/068081.html

class X (object):
    pass

X() += 2

> SyntaxError: can't assign to function call

Suppose I actually had defined __iadd__ for class X.  Python says this
syntax is invalid.  I wish is wasn't.

Here's where I might use it.  Suppose I have a container class.  Suppose I
could make a slice of this container, like so:

c = Container()
s = Slice (c, 0, 10)

where "Slice" is a class.  Then:

s += 2

Would perform iadd on the slice of the container.  A convenient syntax would
be:

Slice (c, 0, 10) += 2

Does anyone else think this would be a good addition to Python?

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