On Sat, May 1, 2021 at 2:52 AM Jonathan Fine <[email protected]> wrote:
>
> Hi David
>
> I see where you are coming from. I find it helps to think of sep.join as a
> special case. Here's a more general join, with sep.join equivalent to
> genjoin(sep, '', '').
>
> def genjoin(sep, left, right):
> def fn(items):
> return left + sep.join(items) + right
> return fn
>
> Here's how it works
>
> genjoin('', '', '')('0123') == '0123'
> genjoin(',', '', '')('0123') == '0,1,2,3'
> genjoin(',', '[', ']')('0123') == '[0,1,2,3]'
>
> All of these examples of genjoin can be thought of as string comprehensions.
> But they don't fit into your pattern for a string comprehension literal.
>
For those cases where you're merging literal parts and generated
parts, it may be of value to use an f-string:
>>> f"[{','.join('0123')}]"
'[0,1,2,3]'
The part in the braces is evaluated as Python code, and the rest is
simple literals.
ChrisA
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