operations with empty strings | rfind () function

Michael Zippo 18.07.2021

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:

< / tbody>

# 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]

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# 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)