[Python-Dev] Every Release Can Be a Mini "Python 4000", Within Reason (was (name := expression) doesn't fit the narrative of PEP 20)
On 4/29/2018 11:51 PM, Guido van Rossum wrote:
> On Sun, Apr 29, 2018 at 10:45 AM, Eitan Adler <lists at eitanadler.com
> <mailto:lists at eitanadler.com>> wrote:
> On 29 April 2018 at 01:34, Jeff Allen <ja.py at farowl.co.uk
> <mailto:ja.py at farowl.co.uk>> wrote:
> > On 27/04/2018 08:38, Greg Ewing wrote:
> > I speculate this all goes back to some pre-iteration version of FORmula
> > TRANslation, where to its inventors '=' was definition and these really were
> > "statements" in the normal sense of stating a truth.
> That blog post was brought up before in this discussion (probably on
> python-ideas). I have my doubts about whether it accurately represents
> the historic truth though.
It is woefully incomplete in omitting the common usage of = to mean
'equals' both as statement (comparison) and command (assignment) in both
English and math. I don't have any math books that I know of that
predate computers, but I suspect the usage is not new.
The pre-C computer language history has a gaping hole: BASIC, which uses
= for both assignment and comparison, was released May 1, 1964. I don't
believe the syntax allowed any ambiguity as to the meaning of each
occurrence. To me, it is the use of anything else that needs explaining.
Terry Jan Reedy