Function index

numpy/_core/strings.py:337–367

Like `find`, but raises :exc:`ValueError` when the substring is not found. Parameters ---------- a : array-like, with ``StringDType``, ``bytes_``, or ``str_`` dtype sub : array-like, with ``StringDType``, ``bytes_``, or ``str_`` dtype start, end : array_like, with any int

(a, sub, start=0, end=None)

@set_module("numpy.strings")
def index(a, sub, start=0, end=None):
    """
    Like `find`, but raises :exc:`ValueError` when the substring is not found.

    Parameters
    ----------
    a : array-like, with ``StringDType``, ``bytes_``, or ``str_`` dtype

    sub : array-like, with ``StringDType``, ``bytes_``, or ``str_`` dtype

    start, end : array_like, with any integer dtype, optional

    Returns
    -------
    out : ndarray
        Output array of ints.

    See Also
    --------
    find, str.index

    Examples
    --------
    >>> import numpy as np
    >>> a = np.array(["Computer Science"])
    >>> np.strings.index(a, "Science", start=0, end=None)
    array([9])

    """
    end = end if end is not None else MAX
    return _index_ufunc(a, sub, start, end)


@set_module("numpy.strings")