Add str.split_iter function

[uwinx]

BPO	42816
Nosy	@vstinner, @ezio-melotti, @stevendaprano, @serhiy-storchaka, @uwinx
Superseder	bpo-17343: Add a version of str.split which returns an iterator

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2021-01-03.13:58:27.803>
created_at = <Date 2021-01-03.13:09:42.457>
labels = ['type-feature', '3.10', 'expert-unicode']
title = 'Add str.split_iter function'
updated_at = <Date 2021-01-03.13:58:27.802>
user = 'https://github.com/uwinx'

bugs.python.org fields:

activity = <Date 2021-01-03.13:58:27.802>
actor = 'serhiy.storchaka'
assignee = 'none'
closed = True
closed_date = <Date 2021-01-03.13:58:27.803>
closer = 'serhiy.storchaka'
components = ['Unicode']
creation = <Date 2021-01-03.13:09:42.457>
creator = 'uwinx'
dependencies = []
files = []
hgrepos = []
issue_num = 42816
keywords = []
message_count = 4.0
messages = ['384270', '384274', '384275', '384276']
nosy_count = 5.0
nosy_names = ['vstinner', 'ezio.melotti', 'steven.daprano', 'serhiy.storchaka', 'uwinx']
pr_nums = []
priority = 'normal'
resolution = 'duplicate'
stage = 'resolved'
status = 'closed'
superseder = '17343'
type = 'enhancement'
url = 'https://bugs.python.org/issue42816'
versions = ['Python 3.10']

[uwinx]

Split string by given separator and return iterator as a result.

The naive and not very efficient solution would be using current str.split:

def split_iter(self: str, sep: str) -> 'Iterator[str]':
    return iter(self.split(sep))

Probably, need we'll some better solution without allocating new list.

[stevendaprano]

I am pretty sure this has been discussed and rejected on the Python-Ideas mailing list before.

If not rejected, the idea didn't go very far. You may wish to search the mailing list archives for previous discussions.

Either way, I think this should be discussed on Python-Ideas, to see if there is a consensus on this, and whether or not this is a large enough change that it needs a PEP.

[stevendaprano]

See also discussion here: bpo-17343

[serhiy-storchaka]

bpo-17343 mentions also a separate method str.itersplit, so I close this issue as a duplicate.