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numpy.core.defchararray.rfind
numpy.core.defchararray.rfind(a, sub, start=0, end=None)[source]- 
    
For each element in
a, return the highest index in the string where substringsubis found, such thatsubis contained within [start,end].Calls
str.rfindelement-wise.Parameters: - 
           
a : array-like of str or unicode - 
           
sub : str or unicode - 
           
start, end : int, optional - 
           
Optional arguments
startandendare interpreted as in slice notation. 
Returns: - 
           
out : ndarray - 
           
Output array of ints. Return -1 on failure.
 
See also
 - 
           
 
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 https://docs.scipy.org/doc/numpy-1.16.1/reference/generated/numpy.core.defchararray.rfind.html