[Python-ideas] Inline assignments using "given" clauses

Steven D'Aprano steve at pearwood.info
Sun May 13 07:23:48 EDT 2018


On Sat, May 12, 2018 at 07:36:33PM -0400, Juancarlo Añez wrote:

> Python already uses "in", which is used in other languages to introduce
> context.

Fortunately, we don't have to come up with syntax that works with other 
languages, only Python.


> The statement structure of "with...as" seems desirable

But it's not a statement, its an expression.


> just asking for a word that is not "with" or "given".

How about "antidisestablishmentarianism"? That's unlikely to be used in 
many programs, so we could make it a keyword.

*wink*

I jest, of course. But I don't think "with" reads well, and given 
doesn't really work for me either *as prose*.

In my experience mathematicians put the given *before* the statement:

   Given a, b, c three sides of a triangle, then

       Area = sqrt(s*(s-a)*(s-b)*(s-c))

   where s = (a + b + c)/2 is the semi-perimeter of the triangle.

For the record, that is almost exactly what I wrote for a student 
earlier today, and its not just me, it is very similar to the wording 
used on both Wolfram Mathworld and Wikipedia's pages on Heron's Formula.

http://mathworld.wolfram.com/HeronsFormula.html

https://en.wikipedia.org/wiki/Heron%27s_formula


Putting "given" after the expression is backwards.



-- 
Steve


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