On 11/29/2021 8:16 PM, Guido van Rossum wrote:
On Mon, Nov 29, 2021 at 5:01 PM Terry Reedy <[email protected]
<mailto:[email protected]>> wrote:
On 11/29/2021 5:56 PM, Barry Warsaw wrote:
> On Nov 25, 2021, at 13:41, Christopher Barker
<[email protected] <mailto:[email protected]>> wrote:
>> What is their role? Up to today, I have treated them as an
advanced feature, useful for "complex codebases".
But there are any
number of examples springing up on the internet, to the point where
many students now think they are "best practice", if not actually
required.
Chris, can you say anything more about why people would get such a
mis-impression?
> This is an important observation. As much as I’m in the "type
annotations are good" crowd now, I still think they should always be
optional. Python’s use is so broad these days, I for one don’t want
to have to add annotations to every bit of Python I write.
Maybe it should be reiterated with whatever decision comes forth that
>>> def muladd(x, y, z):
... return x * (y+z)
...
>>> muladd(3.1459, 87.33, 2.7e2)
1124.124447
>>> muladd(3, 5, 7)
36
>>> from fractions import Fraction as Fr
>>> muladd(Fr(22, 7), 87, Fr(2714, 100))
Fraction(62777, 175)
>>> muladd(3, 'hel', 'lo ')
'hello hello hello '
and other duck-typed code will always be legal, idiomatic, and even
expected as good practice for beginner, informal, exploratory, and
similar python code.
Why would it need to be reiterated? Are there really people who believe
that such code would become invalid? AFAIK *everybody* here agrees that
this should stay valid. So who would we be reiterating it for?
The people that Chris B. referred to, and their 'sources'. But we need
more info to know how to best counter such wrong beliefs.
--
Terry Jan Reedy
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