numpy.core.defchararray.join(sep, arr) is another function for doing string operations in numpy. For each element in arr, it returns a copy of the string in which the string elements of array have been joined by separator.

Parameters: sep : It joins elements with the string between them. arr :Input array. Returns : Output array of str or unicode with joined elements.

Code #1 : Python3

# Python program explaining
# numpy.core.defchararray.join() method 

# importing numpy 
import numpy as geek

# input array 
in_arr = geek.array(['Python', 'Numpy', 'Pandas'])
print ("Input original array : ", in_arr) 

# creating the separator
sep = geek.array(['-', '+', '*'])


out_arr = geek.core.defchararray.join(sep, in_arr)
print ("Output joined array: ", out_arr)