[Python-Dev] Examples for PEP 572 (original) (raw)

Chris Angelico rosuav at gmail.com
Tue Jul 3 17:51:26 EDT 2018

On Wed, Jul 4, 2018 at 7:37 AM, Serhiy Storchaka <storchaka at gmail.com> wrote:

I believe most Python users are not professional programmers -- they are sysadmins, scientists, hobbyists and kids --

[citation needed]

In particularly mutating and non-mutating operations are separated. The assignment expression breaks this.

[citation needed]

In terms of blending mutating and non-mutating operations, augmented assignment is far worse. Contrast:

x = 1 y = x x += 1

a = [1] b = a a += [2]

Assignment expressions do the exact same thing as assignment statements, but also allow you to keep using that value. There is nothing about mutation. (Unless you believe that assignment itself is mutation, in which case Python is definitely the wrong language for you.)

ChrisA

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