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Preview: _itertools.py Size: 1.25 KB

//lib64/python3.12/importlib/resources/_itertools.py

# from more_itertools 9.0
def only(iterable, default=None, too_long=None):
    """If *iterable* has only one item, return it.
    If it has zero items, return *default*.
    If it has more than one item, raise the exception given by *too_long*,
    which is ``ValueError`` by default.
    >>> only([], default='missing')
    'missing'
    >>> only([1])
    1
    >>> only([1, 2])  # doctest: +IGNORE_EXCEPTION_DETAIL
    Traceback (most recent call last):
    ...
    ValueError: Expected exactly one item in iterable, but got 1, 2,
     and perhaps more.'
    >>> only([1, 2], too_long=TypeError)  # doctest: +IGNORE_EXCEPTION_DETAIL
    Traceback (most recent call last):
    ...
    TypeError
    Note that :func:`only` attempts to advance *iterable* twice to ensure there
    is only one item.  See :func:`spy` or :func:`peekable` to check
    iterable contents less destructively.
    """
    it = iter(iterable)
    first_value = next(it, default)

    try:
        second_value = next(it)
    except StopIteration:
        pass
    else:
        msg = (
            'Expected exactly one item in iterable, but got {!r}, {!r}, '
            'and perhaps more.'.format(first_value, second_value)
        )
        raise too_long or ValueError(msg)

    return first_value

Name	Size	Perms	Modified	Actions
__pycache__ DIR	-	drwxr-xr-x	2026-01-08 23:02:23	Edit Download recursive recursive
abc.py	5.08 KB	lrw-r--r--	2025-10-09 11:07:00	Edit Download recursive recursive
readers.py	4.27 KB	lrw-r--r--	2025-10-09 11:07:00	Edit Download recursive recursive
simple.py	2.52 KB	lrw-r--r--	2025-10-09 11:07:00	Edit Download recursive recursive
_adapters.py	4.38 KB	lrw-r--r--	2025-10-09 11:07:00	Edit Download recursive recursive
_common.py	5.36 KB	lrw-r--r--	2025-10-09 11:07:00	Edit Download recursive recursive
_itertools.py	1.25 KB	lrw-r--r--	2025-10-09 11:07:00	Edit Download recursive recursive
_legacy.py	2.88 KB	lrw-r--r--	2025-10-09 11:07:00	Edit Download recursive recursive
__init__.py	532 B	lrw-r--r--	2025-10-09 11:07:00	Edit Download recursive recursive

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