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numpy string operations | rfind() function

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  • Last Updated : 23 Jan, 2019

numpy.core.defchararray.find(arr, sub, start=0, end=None) is another function for doing string operations in numpy.It returns the highest index in the string where substring sub is found for each element in arr.It returns -1 if sub is not contained within [start, end].

Parameters:
arr : array_like of str or unicode.
sub : [str or unicode] The substring which to be searched.
start : [ int, optional] The starting location in each string.
end : [ int, optional] The ending location in each string.

Returns : [ndarray] Output array of ints.

Code #1 :




# Python program explaining
# numpy.char.rfind() method 
  
# importing numpy as geek
import numpy as geek
  
# input arrays  
in_arr = geek.array(['aAaAaA', 'baA', 'abBABba'])
print ("Input array : ", in_arr) 
  
# output arrays 
out_arr = geek.char.rfind(in_arr, sub ='A')
print ("Output array: ", out_arr) 

Output:

Input array :  ['aAaAaA' 'baA' 'abBABba']
Output array:  [5 2 3]

 
Code #2 :




# Python program explaining
# numpy.char.rfind() method 
  
# importing numpy as geek
import numpy as geek
  
# input arrays  
in_arr = geek.array(['aAaAaA', 'aA', 'abBABba'])
print ("Input array : ", in_arr) 
  
# output arrays 
out_arr = geek.char.rfind(in_arr, sub ='a', start = 3, end = 7)
print ("Output array: ", out_arr) 

Output:

Input array :  ['aAaAaA' 'aA' 'abBABba']
Output array:  [ 4 -1  6]

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