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/NumPy 1.17

numpy.char.rindex

numpy.char.rindex(a, sub, start=0, end=None)

Like rfind, but raises ValueError when the substring sub is not found.

Calls str.rindex element-wise.

Parameters:
a : array-like of str or unicode
sub : str or unicode
start, end : int, optional
Returns:
out : ndarray

Output array of ints.

See also

rfind, str.rindex

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https://docs.scipy.org/doc/numpy-1.17.0/reference/generated/numpy.char.rindex.html