Top 10 String methods in Pandas

In simple terms, string methods in Pandas are a set of tools that help us manipulate and work with text (also known as strings) in our data. Pandas, which is a powerful Python library for data manipulation, provides a variety of built-in tools to make that job easier. Instead of manually going through each piece of text and making changes, these string methods allow us to do things like:

• Convert all text to lowercase or uppercase
• Remove extra spaces or unwanted characters
• Extract parts of text based on patterns
• Find and replace certain words or characters

String Methods in Pandas

These string methods work in a very efficient way on entire columns of data, so you can modify thousands or even millions of text entries at once without breaking a sweat.

Let’s explore each method in detail with example:

We will be using the below data frame for the purpose of the illustration.

import pandas as pd
sports = pd.Series(['Virat', 'azam', 'fiNch', 'ShakiB', 'STOKES', 'KAne'])
print(sports)

Output:

1.) DataFrame.upper()

Convert each string to upper case. This method is useful when normalizing text data for consistency (e.g., converting names or categories to uppercase).

print("Upper Case:")
print(sports.str.upper())

Output:

2.) DataFrame.lower()

It converts all characters to lowercase and ensure consistency in text data.

print("Lower Case:")
print(s.str.lower())

Output:

3.) DataFrame.isupper()

It returns boolean values based on whether each character present in the string is in upper case or not.

print("Checks whether string is in Upper Case:")
print(sports.str.isupper())

Output:

4.) DataFrame.islower()

It returns boolean values based on whether each character present in the string is in lowercase or not.

print("Checks whether string is in Lower Case:")
print(s.str.islower())

Output:

5.) DataFrame.len()

This function returns the length of each string.

print("Length of strings:")
print(sports.str.len())

Output:

6.) DataFrame.startswith()

It returns boolean values based on whether the string starts with a certain character sequence or not.

print("Checks whether string starts with certain substring:")
print(sports.str.startswith('a'))

Output:

7.) DataFrame.split()

This function helps to split the string by a certain character or symbols at once.

print("Splits string by character 'a':")
print(sports.str.split('a'))

Output:

8.) DataFrame.find()

This function finds the index of the occurrence of a certain character sequence.

print("Find the index of the searched character or substring:")
print(sports.str.find('a'))

Output:

9.) DataFrame.strip()

It helps to remove the extra trailing spaces from the start and the end.

print("Remove extra space from the starting and the end of the string:")
print(s.str.strip())

Output:

10.) DataFrame.replace()

This function helps to remove certain character sequence sometimes which are present in all the strings and is undesired.

print("Replace a particular substring by desired pattern:")
print(sports.str.replace('a', ''))

Output: