How to lowercase strings in a column in Pandas dataframe Last Updated : 21 Mar, 2023 Comments Improve Suggest changes Like Article Like Report Analyzing real-world data is somewhat difficult because we need to take various things into consideration. Apart from getting the useful data from large datasets, keeping data in required format is also very important. One might encounter a situation where we need to lowercase each letter in any specific column in given dataframe. Let's see how to lowercase column names in Pandas dataframe. Let's create a dataframe from the dict of lists. Python3 # Create a simple dataframe # importing pandas as pd import pandas as pd # creating a dataframe df = pd.DataFrame({'A': ['John', 'bODAY', 'MinA', 'Peter', 'nicky'], 'B': ['masters', 'graduate', 'graduate', 'Masters', 'Graduate'], 'C': [27, 23, 21, 23, 24]}) df Output: There are certain methods we can change/modify the case of column in pandas dataframe. Let's see how can we lowercase column names in Pandas dataframe using lower() method. Method #1: Python3 # Create a simple dataframe # importing pandas as pd import pandas as pd # creating a dataframe df = pd.DataFrame({'A': ['John', 'bODAY', 'MinA', 'Peter', 'nicky'], 'B': ['masters', 'graduate', 'graduate', 'Masters', 'Graduate'], 'C': [27, 23, 21, 23, 24]}) df['A'] = df['A'].str.lower() df Output: Method #2: Python3 # Create a simple dataframe # importing pandas as pd import pandas as pd # creating a dataframe df = pd.DataFrame({'A': ['John', 'bODAY', 'MinA', 'Peter', 'nicky'], 'B': ['masters', 'graduate', 'graduate', 'Masters', 'Graduate'], 'C': [27, 23, 21, 23, 24]}) df['A'].apply(lambda x: x.lower()) Output: Comment More info S Shivam_k Follow Improve Article Tags : Python Python-pandas Python pandas-dataFrame pandas-dataframe-program 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 4 min read Python Lambda Functions 5 min read Python Data StructuresPython String 5 min read Python Lists 4 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