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Re: Weak Type Ability for Python

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From: python@mrabarnett.plus.com (MRAB)
Newsgroups: comp.lang.python
Subject: Re: Weak Type Ability for Python
Date: Thu, 13 Apr 2023 03:28:37 +0100
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by: MRAB - Thu, 13 Apr 2023 02:28 UTC

On 2023-04-13 03:12, avi.e.gross@gmail.com wrote:
> As originally written, the question posed has way too many possible answers
> but the subject line may give a hint. Forget printing.
>
> The Python statement
> 1 + "a"
>
> SHOULD fail. The first is an integer and the second is string. These two
> are native Python objects that neither define what to do if they are paired
> with an object of the other type on the left or the right.
>
> In any case, what should the answer be? Since "a" has no integer value, it
> presumably was intended to be the string "1a".
>
> So why NOT use the built-in conversion and instead of:
>
> print(x+y) # where x=1, y='a'
>
> It should be:
>
> print(str(x) + y)
>
> Could this behavior be added to Python? Sure. I wonder how many would not
> like it as it often will be an error not caught!
>
> If you defined your own object derived from string and added a __radd__()
> method then the method could be made to accept whatever types you wanted
> (such as integer or double or probably anything) and simply have code that
> converts it to the str() representation and then concatenates them with, or
> if you prefer without, any padding between.
>
> I suspect the OP is thinking of languages like PERL or JAVA which guess for
> you and make such conversions when it seems to make sense.
>
In the case of Perl, there are distinct operators for addition and
string concatenation, with automatic type conversion (non-numeric
strings have a numeric value of 0, which can hide bugs).

> Python does not generally choose that as it is quite easy to use one of so
> many methods, and lately an f-string is an easy way as others mentioned.
>
>
> -----Original Message-----
> From: Python-list <python-list-bounces+avi.e.gross=gmail.com@python.org> On
> Behalf Of Thomas Passin
> Sent: Wednesday, April 12, 2023 2:52 PM
> To: python-list@python.org
> Subject: Re: Weak Type Ability for Python
>
> On 4/12/2023 1:11 PM, Chris Angelico wrote:
>> On Thu, 13 Apr 2023 at 03:05, Ali Mohseni Roodbari
>> <ali.mohseniroodbari@gmail.com> wrote:
>>>
>>> Hi all,
>>> Please make this command for Python (if possible):
>>>
>>>>>> x=1
>>>>>> y='a'
>>>>>> wprint (x+y)
>>>>>> 1a
>>>
>>> In fact make a new type of print command which can print and show strings
>>> and integers together.
>>>
>>
>> Try:
>>
>> print(x, y)
>>
>> ChrisA
>
> It puts a space between "1" and "a", whereas the question does not want
> the space. print(f'{x}{y}') would do it, but only works for variables
> named "x" and "y".
>
> As happens so often, the OP has not specified what he actually wants to
> do so we can only answer the very specific question.
>

Function reject.

devel / comp.lang.python / Re: Weak Type Ability for Python

devel / comp.lang.python / Re: Weak Type Ability for Python

Subject	Author
Re: Weak Type Ability for Python	MRAB