numpy string operations | join() function Last Updated : 05 Feb, 2019 Comments Improve Suggest changes Like Article Like Report 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) Output: Input original array : ['Python' 'Numpy' 'Pandas'] Output joined array: ['P-y-t-h-o-n' 'N+u+m+p+y' 'P*a*n*d*a*s'] Comment More info J jana_sayantan Follow Improve Article Tags : Python Python-numpy Python numpy-String Operation Explore Python FundamentalsPython Introduction 3 min read Input and Output in Python 4 min read Python Variables 5 min read Python Operators 5 min read Python Keywords 2 min read Python Data Types 7 min read Conditional Statements in Python 3 min read Loops in Python - For, While and Nested Loops 6 min read Python Functions 5 min read Recursion in Python 6 min read Python Lambda Functions 5 min read Python Data StructuresPython String 5 min read Python Lists 5 min read Python Tuples 4 min read Python Dictionary 3 min read Python Sets 6 min read Python Arrays 7 min read List Comprehension in Python 4 min read Advanced PythonPython OOP Concepts 11 min read Python Exception Handling 5 min read File Handling in Python 4 min read Python Database Tutorial 4 min read Python MongoDB Tutorial 2 min read Python MySQL 9 min read Python Packages 12 min read Python Modules 7 min read Python DSA Libraries 15 min read List of Python GUI Library and Packages 3 min read Data Science with PythonNumPy Tutorial - Python Library 3 min read Pandas Tutorial 6 min read Matplotlib Tutorial 5 min read Python Seaborn Tutorial 15+ min read StatsModel Library- Tutorial 4 min read Learning Model Building in Scikit-learn 8 min read TensorFlow Tutorial 2 min read PyTorch Tutorial 7 min read Web Development with PythonFlask Tutorial 8 min read Django Tutorial | Learn Django Framework 7 min read Django ORM - Inserting, Updating & Deleting Data 4 min read Templating With Jinja2 in Flask 6 min read Django Templates 7 min read Python | Build a REST API using Flask 3 min read How to Create a basic API using Django Rest Framework ? 4 min read Python PracticePython Quiz 3 min read Python Coding Practice 1 min read Python Interview Questions and Answers 15+ min read Like