numpy string operations | less() function

numpy.core.defchararray.less(arr1, arr2) is another function for doing string operations in NumPy. It checks the elements of two same shaped string arrays one by one and returns True if the elements of arr1 are less than the elements of arr2 i.e. arr1 < arr2 . Otherwise, it returns False.

Parameters:
arr1 : array_like of str or unicode.1st input array. 
arr2 : array_like of str or unicode.2nd input array.
Returns : [ndarray] Output array of bools, or a single bool if arr1 and arr2 are scalars.

Code #1 : 

Python3

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

# importing numpy
import numpy as geek

# input arrays
in_arr1 = geek.array('numpy')
print ("1st Input array : ", in_arr1)

in_arr2 = geek.array('number')
print ("2nd Input array : ", in_arr2)

# checking if in_arr1 < in_arr2
out_arr = geek.char.less(in_arr1, in_arr2)
print ("Output array: ", out_arr)

Output:

1st Input array :  numpy
2nd Input array :  number
Output array:  False

Code #2 : 

Python3

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

# importing numpy
import numpy as geek

# input arrays
in_arr1 = geek.array(['Geeks', 'for', 'Geek', 'Numpy'])
print ("1st Input array : ", in_arr1)

in_arr2 = geek.array(['Geek', 'for', 'geek', 'numpy'])
print ("2nd Input array : ", in_arr2)

# checking if in_arr1 < in_arr2
out_arr = geek.char.less(in_arr1, in_arr2)
print ("Output array: ", out_arr)

Output:

1st Input array :  ['Geeks' 'for' 'Geek' 'Numpy']
2nd Input array :  ['Geek' 'for' 'geek' 'numpy']
Output array:  [False False  True  True]

Code #3 : 

Python3

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

# importing numpy
import numpy as geek

# input arrays
in_arr1 = geek.array(['10', '11', '122', '15'])
print ("1st Input array : ", in_arr1)

in_arr2 = geek.array(['10', '13', '121', '141'])
print ("2nd Input array : ", in_arr2)

# checking if in_arr1 < in_arr2
out_arr = geek.char.less(in_arr1, in_arr2)
print ("Output array: ", out_arr)

Output:

1st Input array :  ['10' '11' '122' '15']
2nd Input array :  ['10' '13' '121' '141']
Output array:  [False  True False False]