Python dot-equals (syntax proposal)

[Terry Reedy]

* Terry Reedy:

* Alf P. Steinbach:

* Aahz:

and sometimes
they rebind the original target to the same object.

At the Python level that seems to be an undetectable null-operation.

If you try t=(1,2,3); t[1]+=3, if very much matters that a rebind occurs.
Testing:

t = ([], [], [])
t ([], [], [])
t[0] += ["blah"]

Traceback (most recent call last):

t (['blah'], [], [])
_

</test>

Yep, it matters.

So one should instead write t[0].extend('blah') to the same effect, but
without the exception raising assignment attempt, when that is what one
really means ;-).

Terry Jan Reedy