관리-도구
편집 파일: _itertools.cpython-38.pyc
U +�e� � @ s ddd�Z d S )Nc C sP t | �}t||�}z t|�}W n tk r2 Y nX d�||�}|pJt|��|S )a( 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. zLExpected exactly one item in iterable, but got {!r}, {!r}, and perhaps more.)�iter�next� StopIteration�format� ValueError)�iterable�defaultZtoo_long�itZ first_valueZ second_value�msg� r �L/opt/hc_python/lib/python3.8/site-packages/importlib_resources/_itertools.py�only s �� r )NN)r r r r r �<module> �