numpy string operations | isalpha() function

numpy.core.defchararray.isalpha(arr) function returns True for each element if all characters in the string are alphabetic and there is at least one character; returns false otherwise.

Parameters:
arr : array_like of str or unicode.

Returns : [ndarray] Output array of bools.

Code #1 :

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

import numpy as geek

# input array
in_arr = geek.array([ 'abcd', 'ac1bd', 'abdc', 'dcba', 'ab cd'] )
print ("Input array : ", in_arr)

out_arr = geek.char.isalpha(in_arr)
print ("Output array: ", out_arr)

Output:

Input array :  ['abcd' 'ac1bd' 'abdc' 'dcba' 'ab cd']
Output array:  [ True False  True  True False]

Code #2 :

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

import numpy as geek

# input array
in_arr = geek.array([ 'geeks', 'for', 'geeks', 'wow !'] )
print ("Input array : ", in_arr)

out_arr = geek.char.isalpha(in_arr)
print ("Output array: ", out_arr)

Output:

Input array :  ['geeks' 'for' 'geeks' 'wow!']
Output array:  [ True  True  True False]