numpy string operations | find() function (original) (raw)

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 lowest index in the string where substring sub is found for each element in arr within the range start to end.It returns -1 otherwise.

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 :

import numpy as geek

in_arr = geek.array([ 'aAaAaA' , 'baA' , 'abBABba' ])

print ( "Input array : " , in_arr)

out_arr = geek.char.find(in_arr, sub = 'A' )

print ( "Output array: " , out_arr)

Output:

Input array : ['aAaAaA' 'baA' 'abBABba'] Output array: [1 2 3]

Code #2 :

import numpy as geek

in_arr = geek.array([ 'aAaAaA' , 'aA' , 'abBABba' ])

print ( "Input array : " , in_arr)

out_arr = geek.char.find(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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