[Python-ideas] Reverse assignment operators (=+, =-, =*, =/, =//, =**, =%)

[Guido van Rossum]

I think a stronger argument to reject this (even for Python 4, and even if
we could somehow get over the syntactic ambiguity) is that it's confusing.
`+=` and `=+` are just visually too close, and the distinction is not all
that intuitive. At least for `a += b` the expansion to `a = a + b` is a
simple contraction. But for the proposed `a =+ b` the expansion would be a
transposition: `a = b + a`. Given the uncommon use case this just isn't
worth the potential confusion.

(Also, there are other possible meanings one could guess for `a =+ b`,
given the meaning of `a += b`. E.g., because it's the exact mirror image,
you could guess that it means `b = a + b`.)

On Sat, Nov 12, 2016 at 12:23 PM, João Matos <jcrmatos at gmail.com> wrote:

> Hello,
>
> I understand that, but in my view a =- c and a = -c should not be same.
> Maybe an ideia for Python 4.
>
> Best regards,
>
> JM
>
>
> On 12-11-2016 20:19, Bernardo Sulzbach wrote:
>
>> On 2016-11-12 18:08, João Matos wrote:
>>
>>> a =- c is the same as a = c - a
>>>
>>
>> This would break compatibility.
>>
>>     a =- c
>>
>> is
>>
>>     a = -c
>>
>>
>>
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-- 
--Guido van Rossum (python.org/~guido)
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