[Python-ideas] Add list.join() please

Brendan Barnwell brenbarn at brenbarn.net
Tue Jan 29 21:56:54 EST 2019

On 2019-01-29 15:38, Greg Ewing wrote:
> Brendan Barnwell wrote:
>>     Personally what I find is perverse is that .join is a method of
>> strings but does NOT call str() on the items to be joined.
> Neither do most other string methods:
>   >>> s = "hovercraft"
>   >>> s.count(42)
> Traceback (most recent call last):
>     File "<stdin>", line 1, in <module>
> TypeError: Can't convert 'int' object to str implicitly
> Why should join() be any different?

	Oh please.  Because it also RETURNS a string.  Of course count won't 
return a string, it returns a count.  But str.join is for "I want to 
join these items into a single string separated by this delimiter".  If 
the output is to a be a string obtained by combining other items, there 
is nothing lost by converting them to strings.

Brendan Barnwell
"Do not follow where the path may lead.  Go, instead, where there is no 
path, and leave a trail."
    --author unknown

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