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

Robert Vanden Eynde robertve92 at gmail.com
Tue Jan 29 10:24:31 EST 2019

Oh and if you want to write ['a', 'b', 'c'].join('.')

Check out pip install funcoperators and you can write :

['a', 'b', 'c'] |join('.')

Given you defined the function below :

from funcoperators import postfix
def join(sep):
    return postfix(lambda it: sep.join(map(str, it))

You can even choose the operator :

['a', 'b', 'c'] -join('.')
['a', 'b', 'c'] /join('.')
['a', 'b', 'c'] @join('.')

Disclaimer : I'm the creator of funcoperators

On Tue, 29 Jan 2019, 02:43 Jamesie Pic <jpic at yourlabs.org wrote:

> Hello,
> During the last 10 years, Python has made steady progress in convenience
> to assemble strings. However, it seems to me that joining is still, when
> possible, the cleanest way to code string assembly.
> However, I'm still sometimes confused between the different syntaxes used
> by join methods:
> 0. os.path.join takes *args
> 1. str.join takes a list argument, this inconsistence make it easy to
> mistake with the os.path.join signature
> Also, I still think that:
> '_'.join(['cancel', name])
> Would be more readable as such:
> ['cancel', name].join('_')
> Not only this would fix both of my issues with the current status-quo, but
> this would also be completely backward compatible, and probably not very
> hard to implement: just add a join method to list.
> Thanks in advance for your reply
> Have a great day
> --
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