method
chararray.rfind(self, sub, start=0, end=None) For each element in self, return the highest index in the string where substring sub is found, such that sub is contained within [start, end].
See also
char.rfind
© 2005–2019 NumPy Developers
Licensed under the 3-clause BSD License.
https://docs.scipy.org/doc/numpy-1.17.0/reference/generated/numpy.char.chararray.rfind.html