operations with empty strings | rfind () function

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

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# Python program explaining
# numpy.char.rfind () method

 
# import numy as a 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:

Output :

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


# Python program explaining
# numpy.char.rfind () method

 
# import numy 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)