Weak Type Ability for Python

[MRAB]

On 2023-04-13 03:12, avi.e.gross at 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 at python.org> On
> Behalf Of Thomas Passin
> Sent: Wednesday, April 12, 2023 2:52 PM
> To: python-list at 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 at 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.
>