numpy string operations | lower() function Last Updated : 14 Jan, 2019 Comments Improve Suggest changes Like Article Like Report numpy.core.defchararray.lower(arr) function is used to return an array with the elements converted to lowercase. Parameters: arr : [ array_like ] Input array which may be str or unicode. Returns : [ndarray] Output lowercased array of str or unicode, depending on input type. Code #1: Python3 # Python Program explaining # numpy.char.lower() function import numpy as geek in_arr = geek.array(['P4Q R', '4Q RP', 'Q RP4', 'RP4Q']) print ("input array : ", in_arr) out_arr = geek.char.lower(in_arr) print ("output lowercased array :", out_arr) Output: input array : ['P4Q R' '4Q RP' 'Q RP4' 'RP4Q'] output lowercased array : ['p4q r' '4q rp' 'q rp4' 'rp4q'] Code #2: Python3 # Python Program explaining # numpy.char.lower() function import numpy as geek in_arr = geek.array(['GEEKS', 'FOR', 'GEEKS']) print ("input array : ", in_arr) out_arr = geek.char.lower(in_arr) print ("output lowercased array :", out_arr ) Output: input array : ['GEEKS' 'FOR' 'GEEKS'] output lowercased array : ['geeks' 'for' 'geeks'] 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 8 min read Conditional Statements in Python 3 min read Loops in Python - For, While and Nested Loops 7 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 Dictionaries in Python 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