[Python-ideas] Split, slice, join and return "syntax" for str

[Michel Desmoulin]

Even if replace would be a better fit, I can see why doing those 3
operations in one row can be valuable.

But, first, they are not common enough so that it's hard to do:

spam = docs.python.org"
eggs = 'wiki.' + '.'.join(spams.split('.')[1:])

It's not that long to type, and certainly is not happening in every
single script you do.

But let's say for the sake of argument you do a lot of cmd parsing, with
a lot of split and join. Just make a helper:

def rearrange(string, sep=None, start=None, stop=None, step=None):
    return sep.join(string.split(sep)[start:stop:step])

And then you can do:

spam = docs.python.org"
eggs = 'wiki.' + rearrange(spam, '.', 1)

Simple, easy, no need to change Python.



Le 04/03/2018 à 09:59, Andrés Delfino a écrit :
> Hi!
> 
> I was thinking: perhaps it would be nice to be able to quicky split a
> string, do some slicing, and then obtaining the joined string back.
> 
> Say we have the string: "docs.python.org <http://docs.python.org>", and
> we want to change "docs" to "wiki". Of course, there are a ton of
> simpler ways to solve this particular need, but perhaps str could have
> something like this:
> 
> spam = "docs.python.org <http://docs.python.org>"
> eggs = "wiki." + spam['.'][1:]
> print(eggs) #wiki.python.org <http://wiki.python.org>
> 
> A quick implementation to get the idea and try it:
> 
> class Mystr(str):
>     def __getitem__(self, item):
>         if isinstance(item, str):
>             return Mystr_helper(self, item)
>         else:
>             return super().__getitem__(item)
> 
> class Mystr_helper:
>     def __init__(self, obj, sep):
>         self.obj = obj
>         self.sep = sep
>     def __getitem__(self, item):
>         return self.sep.join(self.obj.split(self.sep)[item])
> 
> What are your thoughts?
> 
> Greetings from Argentina.
> 
> 
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