bug fix for islice() in docs

[pernici]

BPO	1171417
Nosy	@rhettinger
Files	libitertools.diff: diff to cvs: python/python/dist/src/Doc/lib/libitertools.tex Revision 1.34

^{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 = 'https://github.com/rhettinger'
closed_at = <Date 2005-03-27.20:20:11.000>
created_at = <Date 2005-03-27.16:03:21.000>
labels = ['library']
title = 'bug fix for islice() in docs'
updated_at = <Date 2005-03-27.20:20:11.000>
user = 'https://bugs.python.org/pernici'

bugs.python.org fields:

activity = <Date 2005-03-27.20:20:11.000>
actor = 'rhettinger'
assignee = 'rhettinger'
closed = True
closed_date = None
closer = None
components = ['Library (Lib)']
creation = <Date 2005-03-27.16:03:21.000>
creator = 'pernici'
dependencies = []
files = ['6572']
hgrepos = []
issue_num = 1171417
keywords = ['patch']
message_count = 2.0
messages = ['48060', '48061']
nosy_count = 2.0
nosy_names = ['rhettinger', 'pernici']
pr_nums = []
priority = 'normal'
resolution = 'accepted'
stage = None
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue1171417'
versions = ['Python 2.4']

[pernici]

The python implementation of islice() in
itertools-functions.html
fails the following test, unlike itertools.islice():

def test_islice():
  it = iter(range(10))
  a = list(islice(it, 0,3))
  next = it.next()
  assert next == 3

test_islice()

A fix is given in the attached file.

[rhettinger]

Logged In: YES
user_id=80475

Checked in an alternate version of the supplied patch.
Also, added the given test.

See:
Doc/lib/libitertools.tex 1.35 and 1.32.2.1
Lib/test/test_itertools.py 1.39