Why not create a new custom class which has this function there? You can
use that object whenever you need the segments.
This is a very rare use case and doesn't make sense to implement that in
str.
On Wed, 25 Dec, 2019, 09:25 python-ideas--- via Python-ideas, <
python-ideas@python.org> wrote:
> Excuse me, ignore my previous post, this is the correct implementation. It
> works for every iterable:
>
> import itertools as itools
>
> def segment(it, n=1):
> if n < 1:
> raise ValueError(f"Number of segment must be > 0")
>
> try:
> len_it = len(it)
> it[0:0]
> it_true = it
> except TypeError:
> it_true = tuple(it)
> len_it = len(it_true)
>
> if len_it < n:
> raise ValueError(f"Iterable length {len_it} must be greater
> than number of segments {n}")
>
> size, rest = divmod(len_it, n)
> sizes = [size] * n
> orig_sizes = sizes.copy()
>
> all_sizes = []
>
> for i in range(1, rest+1):
> for j in range(1, rest-i+2):
> sizes[-j] += i
>
> all_sizes.append(frozenset(itools.permutations(sizes)))
> sizes = orig_sizes.copy()
>
> if not all_sizes:
> all_sizes.append((sizes, ))
>
> res = []
>
> for perm_sizes in all_sizes:
> for sizes in perm_sizes:
> elem = []
>
> i = 0
>
> for size in sizes:
> elem.append(it_true[i:i+size])
> i += size
>
> res.append(elem)
>
> return res
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